Revert "Generate sse2/sse4.1 splices, use them."

This reverts commit 1fe55dc9fa47a73d470438d6298dc3fa959e4528.

Reason for revert: breaking Win GPU bots?

Original change's description:
> Generate sse2/sse4.1 splices, use them.
> 
> While we're at it, tidy up build_stages.py a bit.
> Redirecting stdout seems a lot easier than print >>f all over the place.
> 
> TODO: non-VEX-encoded before_loop() and after_loop()
> 
> CQ_INCLUDE_TRYBOTS=skia.primary:Test-Win2k8-MSVC-GCE-CPU-AVX2-x86_64-Debug
> 
> Change-Id: I3f38e55f081670dd598c6050435466d9f394e5be
> Reviewed-on: https://skia-review.googlesource.com/8230
> Commit-Queue: Mike Klein <mtklein@chromium.org>
> Reviewed-by: Herb Derby <herb@google.com>
> 

TBR=mtklein@chromium.org,herb@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
CQ_INCLUDE_TRYBOTS=skia.primary:Test-Win2k8-MSVC-GCE-CPU-AVX2-x86_64-Debug

Change-Id: Iba1905c54cb2dc42a880b9e6a8093835ffd530a2
Reviewed-on: https://skia-review.googlesource.com/8347
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
3 files changed