Use llvm::sys::fs::createTemporaryFile.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185717 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 3f3d001..1daabcb 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -1616,7 +1616,7 @@
   const {
   SmallString<128> Path;
   llvm::error_code EC =
-    llvm::sys::fs::unique_file(Prefix + "-%%%%%%." + Suffix, Path);
+      llvm::sys::fs::createTemporaryFile(Prefix, Suffix, Path);
   if (EC) {
     Diag(clang::diag::err_unable_to_make_temp) << EC.message();
     return "";