Use StringRef in LangOptions::isNoBuiltinFunc API (NFC)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@283776 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/LangOptions.h

@@ -165,7 +165,7 @@ public:
 
   /// \brief Is this a libc/libm function that is no longer recognized as a
   /// builtin because a -fno-builtin-* option has been specified?
-  bool isNoBuiltinFunc(const char *Name) const;
+  bool isNoBuiltinFunc(StringRef Name) const;
 };
 
 /// \brief Floating point control options

lib/Basic/LangOptions.cpp

@@ -36,8 +36,7 @@ void LangOptions::resetNonModularOptions() {
   CurrentModule.clear();
 }
 
-bool LangOptions::isNoBuiltinFunc(const char *Name) const {
-  StringRef FuncName(Name);
+bool LangOptions::isNoBuiltinFunc(StringRef FuncName) const {
   for (unsigned i = 0, e = NoBuiltinFuncs.size(); i != e; ++i)
     if (FuncName.equals(NoBuiltinFuncs[i]))
       return true;