Updated a usage of createTemporaryFile that does not expect file to be created.

[ilya-biryukov]

Summary

This fixes a usage of createTemporaryFile in clang repo after
a change in llvm repo.

[ilya-biryukov]

A change to llvm repository is here: https://reviews.llvm.org/D36827

[ilya-biryukov]

Self-LGTMing since it's a trivial follow-up to an accepted change.

cfe/trunk/unittests/Tooling/ToolingTest.cpp

EXPECT_TRUE(runToolOnCode(
                           "int x = skipMe<int>();"));
   EXPECT_FALSE(runToolOnCodeWithArgs(
       new SkipBodyAction,
       "template<typename T> int skipMeNot() { an_error_here }", Args2));
 }
 
 TEST(runToolOnCodeWithArgs, TestNoDepFile) {
   llvm::SmallString<32> DepFilePath;
-  ASSERT_FALSE(
-      llvm::sys::fs::createTemporaryFile("depfile", "d", DepFilePath));
+  ASSERT_FALSE(llvm::sys::fs::getPotentiallyUniqueTempFileName("depfile", "d",
+                                                               DepFilePath));
   std::vector<std::string> Args;
   Args.push_back("-MMD");
   Args.push_back("-MT");
   Args.push_back(DepFilePath.str());
   Args.push_back("-MF");
   Args.push_back(DepFilePath.str());
   EXPECT_TRUE(runToolOnCodeWithArgs(new SkipBodyAction, "", Args));
   EXPECT_FALSE(llvm::sys::fs::exists(DepFilePath.str()));