CGBuiltin.cpp: Fix abuse of ArrayRef in EmitOverflowIntrinsic().

In ArrayRef<T>(X), X should not be temporary value. It could be rewritten more redundantly;

  llvm::Type *XTy = X->getType();
  ArrayRef<llvm::Type *> Ty(XTy);
  llvm::Value *Callee = CGF.CGM.getIntrinsic(IntrinsicID, Ty);

Since it is safe if both XTy and Ty are temporary value in one statement, it could be shorten;

  llvm::Value *Callee = CGF.CGM.getIntrinsic(IntrinsicID, ArrayRef<llvm::Type*>(X->getType()));

ArrayRef<T> has an implicit constructor to create uni-entry of T;

  llvm::Value *Callee = CGF.CGM.getIntrinsic(IntrinsicID, X->getType());

MSVC-generated clang.exe crashed.

llvm-svn: 172352