Tweak clang/test/CodeGen/debug-prefix-map.c to appease win32 hosts.

  !1 = !DIFile(filename: "/var/empty\5C<stdin>", directory: "E:\5Cllvm\5Cbuild\5Ccmake-ninja\5Ctools\5Cclang\5Ctest\5CCodeGen")

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@250136 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/debug-prefix-map.c

@@ -16,7 +16,7 @@ void test_rewrite_includes() {
   vprintf("string", argp);
 }
 
-// CHECK-NO-MAIN-FILE-NAME: !DIFile(filename: "/var/empty{{[/\\]}}<stdin>"
+// CHECK-NO-MAIN-FILE-NAME: !DIFile(filename: "/var/empty{{/|\\5C}}<stdin>"
 // CHECK-NO-MAIN-FILE-NAME: !DIFile(filename: "/var/empty{{[/\\]}}{{.*}}"
 // CHECK-NO-MAIN-FILE-NAME: !DIFile(filename: "/var/empty{{[/\\]}}Inputs/stdio.h"
 // CHECK-NO-MAIN-FILE-NAME-NOT: !DIFile(filename: