[HLSL] fmod is not restricting vector size

[kmpeng]

This is in continuation of issue #129003.

We are currently not restricting vector sizes for the fmod intrinsic.

llvm-project/clang/lib/Headers/hlsl/hlsl_intrinsics.h

Lines 137 to 146 in 9d7e1d9

	template <int N>
	_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
	const inline vector<half, N> fmod(vector<half, N> X, vector<half, N> Y) {
	return __detail::fmod_vec_impl(X, Y);
	}
	template <int N>
	const inline vector<float, N> fmod(vector<float, N> X, vector<float, N> Y) {
	return __detail::fmod_vec_impl(X, Y);
	}

We need to exclude vec1s and limit to vec4s, similar to how PR #130724 does it.