Adapt test to be compatible with AIX

This patch updates the following test, which is falling to match ASM lines on AIX for two reasons:
 - `.debug_info` is mapped to `.dwinfo`, so the test fails to match `debug_info` before `DW_TAG_label` occurs
 - AIX uses inline strings, so `DW_AT_NAME` format is different and does not match `DW_AT_decl_file` in the next line.

Reviewed By: shchenz

Differential Revision: https://reviews.llvm.org/D115695

llvm/test/DebugInfo/Generic/debug-label.ll

@@ -17,15 +17,15 @@
 ;
 ; ASM: [[TOP_LOW_PC:[.0-9a-zA-Z]+]]:{{[[:space:]].*}}DEBUG_LABEL: foo:top
 ; ASM: [[DONE_LOW_PC:[.0-9a-zA-Z]+]]:{{[[:space:]].*}}DEBUG_LABEL: foo:done
-; ASM-LABEL: debug_info
+; ASM-LABEL: {{debug_info|dwinfo}}
 ; ASM: DW_TAG_label
 ; ASM-NEXT: DW_AT_name
-; ASM-NEXT: 1 {{.*}} DW_AT_decl_file
+; ASM: 1 {{.*}} DW_AT_decl_file
 ; ASM-NEXT: 4 {{.*}} DW_AT_decl_line
 ; ASM-NEXT: [[TOP_LOW_PC]]{{.*}} DW_AT_low_pc
 ; ASM: DW_TAG_label
 ; ASM-NEXT: DW_AT_name
-; ASM-NEXT: 1 {{.*}} DW_AT_decl_file
+; ASM: 1 {{.*}} DW_AT_decl_file
 ; ASM-NEXT: 7 {{.*}} DW_AT_decl_line
 ; ASM-NEXT: [[DONE_LOW_PC]]{{.*}} DW_AT_low_pc