Switch all uses of LLVM_OVERRIDE to just use 'override' directly.

llvm-svn: 202621
diff --git a/llvm/unittests/Support/CommandLineTest.cpp b/llvm/unittests/Support/CommandLineTest.cpp
index 4f92fef..b0f1eb1 100644
--- a/llvm/unittests/Support/CommandLineTest.cpp
+++ b/llvm/unittests/Support/CommandLineTest.cpp
@@ -147,7 +147,7 @@
 }
 
 class StrDupSaver : public cl::StringSaver {
-  const char *SaveString(const char *Str) LLVM_OVERRIDE {
+  const char *SaveString(const char *Str) override {
     return strdup(Str);
   }
 };