[X86] Cleanup patterns for AVX/SSE for PS operations. Always try to look for bitcasts...

[X86] Cleanup patterns for AVX/SSE for PS operations. Always try to look for bitcasts from floating point types. If only AVX1 is supported we also need to handle integer types with floating point ops without looking for bitcasts.

Previously SSE1 had a pattern that looked for integer types without bitcasts, but the type wasn't legal with only SSE1 and SSE2 add an identical pattern for the integer instructions.

llvm-svn: 278089