[profile] Make a test work if run by the super-user

[vsk]

Summary

This test checks if we get the appropriate error message when writing to an unwritable file. However, it fails on bots which run check-all using sudo (in general this is something we'd like to support). Fix up the test so it works even if run as sudo.

Note: I'm not sure if this patch breaks Windows compatibility. If someone can tell, please comment :).

[kubamracek]

LGTM

[vsk]

Thanks, committed r264773!

test/profile/instrprof-error.c

 // RUN: %clang_profgen -o %t -O3 %s
-// RUN: touch %t.profraw
-// RUN: chmod -w %t.profraw
-// RUN: env LLVM_PROFILE_FILE=%t.profraw LLVM_PROFILE_VERBOSE_ERRORS=1 %run %t 1 2>&1 | FileCheck %s
-// RUN: chmod +w %t.profraw
+// RUN: env LLVM_PROFILE_FILE="/" LLVM_PROFILE_VERBOSE_ERRORS=1 %run %t 1 2>&1 | FileCheck %s
 
 int main(int argc, const char *argv[]) {
   if (argc < 2)
     return 1;
   return 0;
 }
 // CHECK: LLVM Profile: Failed to write file