[patch][rfc] Hookize SMALL_REGISTER_CLASSES, make SSE register classes not small

[Andrew Pinski]

I think:
+  return ! (SSE_FLOAT_MODE_P (mode) || VECTOR_MODE_P (mode));

is not fully correct, it should also check TARGET_SSE_MATH is true for
SSE_FLOAT_MODE_P as SSE_FLOAT_MODE_P does not check that.

Thanks,
Andrew Pinski