Fix formatting. NFC.
Add more feature flags to the x86 instrinsic test.
[x86] Add the (v)cmpps/pd/ss/sd builtins to match gcc. Use them in the sse intrinsic files.

This still lower to the same intrinsics as before.

This is preparation for bounds checking the immediate on the avx version of the builtin so we don't pass illegal immediates into the backend. Since SSE uses a smaller size immediate its not possible to bounds check when using a shared builtin. Rather than creating a clang specific builtin for the different immediate, I decided (after consulting with Chandler) that it was better to match gcc.
[x86] Add range checking to the constant argument of cmpps/pd/ss/sd builtinas.