[NFC][DebugInfo] Use consistent regex group spelling

This is a follow up to c1f2fb5.

Author: petrhosek

lld/test/ELF/conflict-debug-variable2.s

@@ -7,14 +7,14 @@
 # INPUT-NEXT:    DW_AT_name [DW_FORM_strp]       ( .debug_str[0x00000027] = "foo")
 # INPUT-NEXT:    DW_AT_type [DW_FORM_ref4]       (cu + 0x0033 => {0x00000033} "int")
 # INPUT-NEXT:    DW_AT_external [DW_FORM_flag_present]   (true)
-# INPUT-NEXT:    DW_AT_decl_file [DW_FORM_data1] ("/home{{[/\\]}}path{{[/\\]}}test.c")
+# INPUT-NEXT:    DW_AT_decl_file [DW_FORM_data1] ("/home{{(/|\\)}}path{{(/|\\)}}test.c")
 # INPUT-NEXT:    DW_AT_decl_line [DW_FORM_data1] (1)
 # INPUT-NEXT:    DW_AT_location [DW_FORM_exprloc]        (DW_OP_addr 0x0)
 # INPUT:       DW_TAG_variable
 # INPUT-NEXT:    DW_AT_name [DW_FORM_strp]       ( .debug_str[0x0000002f] = "bar")
 # INPUT-NEXT:    DW_AT_type [DW_FORM_ref4]       (cu + 0x0033 => {0x00000033} "int")
 # INPUT-NEXT:    DW_AT_external [DW_FORM_flag_present]   (true)
-# INPUT-NEXT:    DW_AT_decl_file [DW_FORM_data1] ("/home{{[/\\]}}path{{[/\\]}}test.c")
+# INPUT-NEXT:    DW_AT_decl_file [DW_FORM_data1] ("/home{{(/|\\)}}path{{(/|\\)}}test.c")
 # INPUT-NEXT:    DW_AT_decl_line [DW_FORM_data1] (2)
 # INPUT-NEXT:    DW_AT_location [DW_FORM_exprloc]        (DW_OP_addr 0x0)
 

lld/test/wasm/debuginfo.test

@@ -16,21 +16,21 @@ CHECK-NEXT:                DW_AT_low_pc
 CHECK-NEXT:                DW_AT_high_pc
 CHECK-NEXT:                DW_AT_frame_base
 CHECK-NEXT:                DW_AT_name	("test")
-CHECK-NEXT:                DW_AT_decl_file	("/Users{{[/\\]}}yury{{[/\\]}}llvmwasm{{(/|\\)}}hi.c")
+CHECK-NEXT:                DW_AT_decl_file	("/Users{{(/|\\)}}yury{{(/|\\)}}llvmwasm{{(/|\\)}}hi.c")
 CHECK-NEXT:                DW_AT_decl_line	(3)
 CHECK-NEXT:                DW_AT_prototyped	(true)
 
 CHECK:     DW_TAG_formal_parameter
 CHECK-NEXT:                  DW_AT_name	("t")
-CHECK-NEXT:                  DW_AT_decl_file	("/Users{{[/\\]}}yury{{[/\\]}}llvmwasm{{(/|\\)}}hi.c")
+CHECK-NEXT:                  DW_AT_decl_file	("/Users{{(/|\\)}}yury{{(/|\\)}}llvmwasm{{(/|\\)}}hi.c")
 CHECK-NEXT:                  DW_AT_decl_line	(3)
 
 CHECK:   DW_TAG_subprogram
 CHECK-NEXT:                DW_AT_low_pc
 CHECK-NEXT:                DW_AT_high_pc
 CHECK-NEXT:                DW_AT_frame_base
 CHECK-NEXT:                DW_AT_name	("_start")
-CHECK-NEXT:                DW_AT_decl_file	("/Users{{[/\\]}}yury{{[/\\]}}llvmwasm{{(/|\\)}}hi.c")
+CHECK-NEXT:                DW_AT_decl_file	("/Users{{(/|\\)}}yury{{(/|\\)}}llvmwasm{{(/|\\)}}hi.c")
 CHECK-NEXT:                DW_AT_decl_line	(7)
 
 CHECK:   DW_TAG_base_type