Disable unsupported SIMD optimisations for CLPF for 32 bit VS targets

VS compiling for 32 bit targets does not support vector types in
structs as arguments, which makes the v256 type of the intrinsics hard
to support, so optimizations for this target are disabled.

Change-Id: I675394cf1aed0cb18a48f21216470867031b30ce
3 files changed