x86-64: Convert load to mov only for GOTPCRELX relocations

Since converting load to mov needs to rewrite the REX byte and we don't
know if there is a REX byte with GOTPCREL relocation, do it only for
GOTPCRELX relocations.

bfd/

	PR ld/27016
	* elf64-x86-64.c (elf_x86_64_convert_load_reloc): Convert load
	to mov only for GOTPCRELX relocations.

ld/

	PR ld/27016
	* testsuite/ld-x86-64/x86-64.exp: Run pr27016a and pr27016b.
	* testsuite/ld-x86-64/pr27016a.d: New file.
	* testsuite/ld-x86-64/pr27016a.s: Likewise.
	* testsuite/ld-x86-64/pr27016b.d: Likewise.
	* testsuite/ld-x86-64/pr27016b.s: Likewise.

ld/ChangeLog

@@ -1,3 +1,12 @@
+2020-12-04  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/27016
+	* testsuite/ld-x86-64/x86-64.exp: Run pr27016a and pr27016b.
+	* testsuite/ld-x86-64/pr27016a.d: New file.
+	* testsuite/ld-x86-64/pr27016a.s: Likewise.
+	* testsuite/ld-x86-64/pr27016b.d: Likewise.
+	* testsuite/ld-x86-64/pr27016b.s: Likewise.
+
 2020-12-04  Alan Modra  <amodra@gmail.com>
 
 	* testsuite/ld-elf/pr26978a.d,

ld/testsuite/ld-x86-64/pr27016a.d

@@ -0,0 +1,23 @@
+#source: pr27016a.s
+#source: pr27016b.s
+#as: --64 -mx86-used-note=no -mrelax-relocations=no
+#ld: -m elf_x86_64 -z max-page-size=0x200000 -z noseparate-code -e main
+#objdump: -dw
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+0+4000e8 <main>:
+ +[a-f0-9]+:	55                   	push   %rbp
+ +[a-f0-9]+:	48 89 e5             	mov    %rsp,%rbp
+ +[a-f0-9]+:	4c 8d 1d 39 3f 00 00 	lea    0x3f39\(%rip\),%r11        # 40402c <thesym>
+ +[a-f0-9]+:	41 8b 03             	mov    \(%r11\),%eax
+ +[a-f0-9]+:	8d 50 01             	lea    0x1\(%rax\),%edx
+ +[a-f0-9]+:	4c 8d 1d 2c 3f 00 00 	lea    0x3f2c\(%rip\),%r11        # 40402c <thesym>
+ +[a-f0-9]+:	41 89 13             	mov    %edx,\(%r11\)
+ +[a-f0-9]+:	b8 00 00 00 00       	mov    \$0x0,%eax
+ +[a-f0-9]+:	5d                   	pop    %rbp
+ +[a-f0-9]+:	c3                   	ret    
+#pass

ld/testsuite/ld-x86-64/pr27016a.s

@@ -0,0 +1,23 @@
+        .text
+        .comm   global_int,4,4
+        .globl  main
+        .type   main, @function
+main:
+        .cfi_startproc
+        pushq   %rbp
+        .cfi_def_cfa_offset 16
+        .cfi_offset 6, -16
+        movq    %rsp, %rbp
+        .cfi_def_cfa_register 6
+        movq    thesym@GOTPCREL(%rip), %r11
+        movl    (%r11), %eax
+        leal    1(%rax), %edx
+        movq    thesym@GOTPCREL(%rip), %r11
+        movl    %edx, (%r11)
+        movl    $0, %eax
+        popq    %rbp
+        .cfi_def_cfa 7, 8
+        ret
+        .cfi_endproc
+        .size   main, .-main
+        .section        .note.GNU-stack,"",@progbits

ld/testsuite/ld-x86-64/pr27016b.d

@@ -0,0 +1,23 @@
+#source: pr27016a.s
+#source: pr27016b.s
+#as: --64 -mx86-used-note=no -mrelax-relocations=yes
+#ld: -m elf_x86_64 -z max-page-size=0x200000 -z noseparate-code -e main
+#objdump: -dw
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+0+4000e8 <main>:
+ +[a-f0-9]+:	55                   	push   %rbp
+ +[a-f0-9]+:	48 89 e5             	mov    %rsp,%rbp
+ +[a-f0-9]+:	49 c7 c3 2c 40 40 00 	mov    \$0x40402c,%r11
+ +[a-f0-9]+:	41 8b 03             	mov    \(%r11\),%eax
+ +[a-f0-9]+:	8d 50 01             	lea    0x1\(%rax\),%edx
+ +[a-f0-9]+:	49 c7 c3 2c 40 40 00 	mov    \$0x40402c,%r11
+ +[a-f0-9]+:	41 89 13             	mov    %edx,\(%r11\)
+ +[a-f0-9]+:	b8 00 00 00 00       	mov    \$0x0,%eax
+ +[a-f0-9]+:	5d                   	pop    %rbp
+ +[a-f0-9]+:	c3                   	ret    
+#pass

ld/testsuite/ld-x86-64/pr27016b.s

@@ -0,0 +1,4 @@
+	.globl thesym
+thesym = 0x40402c
+
+	.section        .note.GNU-stack,"",@progbits

ld/testsuite/ld-x86-64/x86-64.exp

@@ -661,6 +661,8 @@ run_dump_test "pr22048"
 run_dump_test "pr22929"
 run_dump_test "pr26939"
 run_dump_test "pr26939-x32"
+run_dump_test "pr27016a"
+run_dump_test "pr27016b"
 
 proc undefined_weak {cflags ldflags} {
     set testname "Undefined weak symbol"