New effective-target 'asm_goto_with_outputs'

After commit e16f90be2d
"testsuite: Fix up lra effective target", we get for nvptx target:

    -PASS: gcc.c-torture/compile/asmgoto-2.c   -O0  (test for excess errors)
    +ERROR: gcc.c-torture/compile/asmgoto-2.c   -O0 : no files matched glob pattern "lra1020113.c.[0-9][0-9][0-9]r.reload" for " dg-do 2 compile { target lra } "

Etc.

However, nvptx appears to support 'asm goto' with outputs, including the
new execution test case:

    PASS: gcc.dg/pr107385.c execution test

Therefore, generally use new effective-target 'asm_goto_with_outputs' instead
of 'lra'.  One exceptions is 'gcc.dg/pr110079.c', which doesn't use 'asm goto'
with outputs, and continues using effective-target 'lra', with special-casing
nvptx target, to avoid ERROR for 'lra'.

	gcc/
	* doc/sourcebuild.texi (Effective-Target Keywords): Document
	'asm_goto_with_outputs'.  Add comment to 'lra'.
	gcc/testsuite/
	* lib/target-supports.exp (check_effective_target_lra): Add
	comment.
	(check_effective_target_asm_goto_with_outputs): New.
	* gcc.c-torture/compile/asmgoto-2.c: Use it.
	* gcc.c-torture/compile/asmgoto-5.c: Likewise.
	* gcc.c-torture/compile/asmgoto-6.c: Likewise.
	* gcc.c-torture/compile/pr98096.c: Likewise.
	* gcc.dg/pr100590.c: Likewise.
	* gcc.dg/pr107385.c: Likewise.
	* gcc.dg/pr108095.c: Likewise.
	* gcc.dg/pr97954.c: Likewise.
	* gcc.dg/torture/pr100329.c: Likewise.
	* gcc.dg/torture/pr100398.c: Likewise.
	* gcc.dg/torture/pr100519.c: Likewise.
	* gcc.dg/torture/pr110422.c: Likewise.
	* gcc.dg/pr110079.c: Special-case nvptx target.

gcc/doc/sourcebuild.texi

@@ -2871,6 +2871,9 @@ Target supports weak undefined symbols
 @item R_flag_in_section
 Target supports the 'R' flag in .section directive in assembly inputs.
 
+@item asm_goto_with_outputs
+Target supports 'asm goto' with outputs.
+
 @item automatic_stack_alignment
 Target supports automatic stack alignment.
 
@@ -2945,6 +2948,9 @@ Target is using an LLVM assembler and/or linker, instead of GNU Binutils.
 
 @item lra
 Target supports local register allocator (LRA).
+This must not be called (results in @code{ERROR}) for targets that
+don't do register allocation, and therefore neither use nor don't use
+LRA.
 
 @item lto
 Compiler has been configured to support link-time optimization (LTO).

gcc/testsuite/gcc.c-torture/compile/asmgoto-2.c

@@ -1,5 +1,5 @@
 /* This test should be switched off for a new target with less than 4 allocatable registers */
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target asm_goto_with_outputs } } */
 int
 foo (void)
 {

gcc/testsuite/gcc.c-torture/compile/asmgoto-5.c

@@ -1,5 +1,5 @@
 /* Test to generate output reload in asm goto on x86_64.  */
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target asm_goto_with_outputs } } */
 /* { dg-skip-if "no O0" { { i?86-*-* x86_64-*-* } && { ! ia32 } } { "-O0" } { "" } } */
 
 #if defined __x86_64__

gcc/testsuite/gcc.c-torture/compile/asmgoto-6.c

@@ -1,5 +1,4 @@
-
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target asm_goto_with_outputs } } */
 /* PR middle-end/110420 */
 /* PR middle-end/103979 */
 /* PR middle-end/98619 */

gcc/testsuite/gcc.c-torture/compile/pr98096.c

@@ -1,6 +1,6 @@
 /* Test for correct naming of label operands in asm goto in case of presence of
    input/output operands. */
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target asm_goto_with_outputs } } */
 int i, j;
 int f(void) {
   asm goto ("# %0 %2" : "+r" (i) ::: jmp);

gcc/testsuite/gcc.dg/pr100590.c

@@ -1,5 +1,5 @@
 /* PR rtl-optimization/100590 */
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target asm_goto_with_outputs } } */
 /* { dg-options "-O1 -fno-dce -w" } */
 
 int

gcc/testsuite/gcc.dg/pr107385.c

@@ -1,5 +1,5 @@
 /* PR middle-end/107385 */
-/* { dg-do run { target lra } } */
+/* { dg-do run { target asm_goto_with_outputs } } */
 /* { dg-options "-O2" } */
 
 __attribute__((noipa)) int

gcc/testsuite/gcc.dg/pr108095.c

@@ -1,5 +1,5 @@
 /* PR tree-optimization/108095 */
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target asm_goto_with_outputs } } */
 /* { dg-options "-Os -g" } */
 
 int v;

gcc/testsuite/gcc.dg/pr110079.c

@@ -1,5 +1,5 @@
 /* PR rtl-optimization/110079 */
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target { nvptx-*-* || lra } } } */
 /* { dg-options "-O2" } */
 /* { dg-additional-options "-freorder-blocks-and-partition" { target freorder } } */
 

gcc/testsuite/gcc.dg/pr97954.c

@@ -1,5 +1,5 @@
 /* PR rtl-optimization/97954 */
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target asm_goto_with_outputs } } */
 /* { dg-options "-O2" } */
 
 int

gcc/testsuite/gcc.dg/torture/pr100329.c

@@ -1,4 +1,4 @@
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target asm_goto_with_outputs } } */
 /* { dg-additional-options "--param tree-reassoc-width=2" } */
 
 unsigned int a0;

gcc/testsuite/gcc.dg/torture/pr100398.c

@@ -1,4 +1,4 @@
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target asm_goto_with_outputs } } */
 
 int
 test5_limit (void)

gcc/testsuite/gcc.dg/torture/pr100519.c

@@ -1,4 +1,4 @@
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target asm_goto_with_outputs } } */
 /* { dg-additional-options "--param tree-reassoc-width=2" } */
 
 unsigned int foo_a1, foo_a2;

gcc/testsuite/gcc.dg/torture/pr110422.c

@@ -1,4 +1,4 @@
-/* { dg-do compile { target lra } } */
+/* { dg-do compile { target asm_goto_with_outputs } } */
 
 struct T { int x; };
 int foo(void) {

gcc/testsuite/lib/target-supports.exp

@@ -13204,7 +13204,9 @@ proc check_effective_target_powerpc_as_p10_htm { } {
     }]
 }
 
-# return 1 if LRA is supported.
+# Return 1 if LRA is supported.  This must not be called (results in ERROR) for
+# targets that don't do register allocation, and therefore neither use nor
+# don't use LRA.
 
 proc check_effective_target_lra { } {
     # Start with heavily used targets which are known to always use LRA.
@@ -13220,6 +13222,15 @@ proc check_effective_target_lra { } {
     } {-O2 -fdump-rtl-reload-details}] ;# LRA notes requires a detailed dump.
 }
 
+# Return 1 if 'asm goto' with outputs is supported, 0 otherwise.
+
+proc check_effective_target_asm_goto_with_outputs { } {
+    if { [istarget nvptx-*-*] } {
+	return 1
+    }
+    return [check_effective_target_lra]
+}
+
 # Test whether optimizations are enabled ('__OPTIMIZE__') per the
 # 'current_compiler_flags' (thus don't cache).