Replace llvm::error_code with std::error_code.

llvm-svn: 210780
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 1d7f180..67e0122 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -1823,8 +1823,7 @@
 std::string Driver::GetTemporaryPath(StringRef Prefix, const char *Suffix)
   const {
   SmallString<128> Path;
-  llvm::error_code EC =
-      llvm::sys::fs::createTemporaryFile(Prefix, Suffix, Path);
+  std::error_code EC = llvm::sys::fs::createTemporaryFile(Prefix, Suffix, Path);
   if (EC) {
     Diag(clang::diag::err_unable_to_make_temp) << EC.message();
     return "";