test: make DebugInfo.macro pass on Windows

The path separator on Windows is \ which is encoded as \5C.  Account for
this in the test.

Author: compnerd

test/DebugInfo/macro.swift

@@ -6,7 +6,7 @@
 
 // CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "macro_enum",
 // CHECK-SAME:             file: ![[MACRO_H:[0-9]+]]
-// CHECK: ![[MACRO_H]] = !DIFile(filename: "{{.*}}/Inputs/Macro.h",
+// CHECK: ![[MACRO_H]] = !DIFile(filename: "{{.*}}{{(/|\\5C)}}Inputs{{(/|\\5C)}}Macro.h",
 
 import Macro