Add test

Author: HaohaiWen

lld/test/COFF/strtab.s

@@ -0,0 +1,29 @@
+# RUN: llvm-mc -triple=x86_64-windows-msvc %s -filetype=obj -o %t.obj
+# RUN: lld-link -out:%t.exe -entry:main %t.obj -debug:dwarf
+# RUN: llvm-readobj --string-table %t.exe | FileCheck %s
+
+# CHECK:      StringTable {
+# CHECK-NEXT:   Length: 87
+# CHECK-NEXT:   [     4] .debug_abbrev
+# CHECK-NEXT:   [    12] .debug_line
+# CHECK-NEXT:   [    1e] long_name_symbolz
+# CHECK-NEXT:   [    30] .debug_abbrez
+# CHECK-NEXT:   [    3e] __impl_long_name_symbolA
+# CHECK-NEXT: }
+
+
+.global main
+.text
+main:
+long_name_symbolz:
+long_name_symbolA:
+__impl_long_name_symbolA:
+name_symbolA:
+.debug_abbrez:
+  ret
+
+.section        .debug_abbrev,"dr"
+.byte 0
+
+.section        .debug_line,"dr"
+.byte 0