x86: Don't define _TLS_MODULE_BASE_ for ld -r

bfd/

	PR ld/29820
	* elfxx-x86.c (_bfd_x86_elf_always_size_sections): Don't define
	 _TLS_MODULE_BASE_ for ld -r.

ld/

	PR ld/29820
	* testsuite/ld-x86-64/pr29820.d: New file.
	* testsuite/ld-x86-64/pr29820.s: Likewise.
	* testsuite/ld-x86-64/x86-64.ex: Run pr29820.

bfd/elfxx-x86.c

@@ -2932,7 +2932,7 @@ _bfd_x86_elf_always_size_sections (bfd *output_bfd,
 {
   asection *tls_sec = elf_hash_table (info)->tls_sec;
 
-  if (tls_sec)
+  if (tls_sec && !bfd_link_relocatable (info))
     {
       struct elf_link_hash_entry *tlsbase;
 

ld/testsuite/ld-x86-64/pr29820.d

@@ -0,0 +1,6 @@
+#ld: -r
+#readelf: -s -W
+
+#...
+ +[0-9]+: +0+ +0 +TLS +GLOBAL +DEFAULT +UND +_TLS_MODULE_BASE_
+#pass

ld/testsuite/ld-x86-64/pr29820.s

@@ -0,0 +1,12 @@
+	.text
+	leaq _TLS_MODULE_BASE_@tlsdesc(%rip), %rax
+	call *_TLS_MODULE_BASE_@tlscall(%rax)
+	movl %fs:a@dtpoff(%rax), %edx
+	addl %fs:b@dtpoff(%rax), %edx
+
+	.section .tbss
+	.zero 8
+a:
+	.zero 4
+b:
+	.zero 4

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

@@ -728,6 +728,7 @@ run_dump_test "pr27016a"
 run_dump_test "pr27016b"
 run_dump_test "report-reloc-1"
 run_dump_test "report-reloc-1-x32"
+run_dump_test "pr29820"
 
 proc undefined_weak {cflags ldflags} {
     set testname "Undefined weak symbol"