[ELF][test] Add testing for dynamic TLS relocations in .debug_info

Differential Revision: https://reviews.llvm.org/D111436

Author: nga888

lld/test/ELF/x86-64-tls-ld-local.s

@@ -1,7 +1,7 @@
 // REQUIRES: x86
 // RUN: llvm-mc %s -o %t.o -filetype=obj -triple=x86_64-pc-linux
 // RUN: ld.lld %t.o -o %t.so -shared
-// RUN: llvm-readobj -r -S %t.so | FileCheck %s
+// RUN: llvm-readobj -r -S --hex-dump=.debug_info %t.so | FileCheck %s
 
 // CHECK:      Relocations [
 // CHECK-NEXT:   Section ({{.*}}) .rela.dyn {
@@ -13,6 +13,9 @@
 // CHECK-NEXT:   }
 // CHECK-NEXT: ]
 
+// CHECK:      Hex dump of section '.debug_info':
+// CHECK-NEXT: 0x00000000 04000000 00000000 00000000 00000000
+
 	data16
 	leaq	bar@TLSGD(%rip), %rdi
 	data16
@@ -27,3 +30,9 @@
 	.section	.tdata,"awT",@progbits
 bar:
 	.long	42
+foo:
+	.long	43
+
+	.section	.debug_info,"",@progbits
+	.quad	foo@DTPOFF
+	.quad	bar@DTPOFF