Fix the build after r364401

It was failing with:

/b/s/w/ir/cache/builder/src/third_party/llvm/llvm/lib/Target/X86/X86ISelLowering.cpp:18772:66:
error: call of overloaded 'makeArrayRef(<brace-enclosed initializer list>)' is ambiguous
     scaleShuffleMask<int>(Scale, makeArrayRef<int>({ 0, 2, 1, 3 }), Mask);
                                                                  ^
/b/s/w/ir/cache/builder/src/third_party/llvm/llvm/lib/Target/X86/X86ISelLowering.cpp:18772:66: note: candidates are:
In file included from /b/s/w/ir/cache/builder/src/third_party/llvm/llvm/include/llvm/CodeGen/MachineFunction.h:20:0,
                 from /b/s/w/ir/cache/builder/src/third_party/llvm/llvm/include/llvm/CodeGen/CallingConvLower.h:19,
                 from /b/s/w/ir/cache/builder/src/third_party/llvm/llvm/lib/Target/X86/X86ISelLowering.h:17,
                 from /b/s/w/ir/cache/builder/src/third_party/llvm/llvm/lib/Target/X86/X86ISelLowering.cpp:14:
/b/s/w/ir/cache/builder/src/third_party/llvm/llvm/include/llvm/ADT/ArrayRef.h:480:15:
note: llvm::ArrayRef<T> llvm::makeArrayRef(const std::vector<_RealType>&) [with T = int]
   ArrayRef<T> makeArrayRef(const std::vector<T> &Vec) {
               ^
/b/s/w/ir/cache/builder/src/third_party/llvm/llvm/include/llvm/ADT/ArrayRef.h:485:37:
note: llvm::ArrayRef<T> llvm::makeArrayRef(const llvm::ArrayRef<T>&) [with T = int]
   template <typename T> ArrayRef<T> makeArrayRef(const ArrayRef<T> &Vec) {
                                     ^

llvm-svn: 364414