commit b9c47f996867ec885a7ede697bd1b0859b6d9301
author mtklein <mtklein@chromium.org> Thu Jul 23 08:37:02 2015 -0700
committer Commit bot <commit-bot@chromium.org> Thu Jul 23 08:37:02 2015 -0700
tree 4ad178012a0f89830af3d20aede0c4e23411bb7c
parent 11dfc8e57a9a485476b4aff93ea2135ee1846d4f

Have Windows use _mm_rsqrt_ss too.

Tidy up a little while I'm in here:
  1) SIMD headers are now included by SkTypes.h as appropriate.
  2) _mm_cvtss_f32() is pithier and generates the same code.

Looks like this is the only code checking for SSE wrong.  After this CL:
    ~/skia (sse) $ git grep __SSE
    include/core/SkPreConfig.h:    #if defined(__SSE4_2__)
    include/core/SkPreConfig.h:    #elif defined(__SSE4_1__)
    include/core/SkPreConfig.h:    #elif defined(__SSE3__)
    include/core/SkPreConfig.h:    #elif defined(__SSE2__)
every other check is in SkPreConfig.h where it belongs.

This is going to affect some GMs subtly on Windows.

BUG=chromium:511458

No public API changes.
TBR=reed@google.com

Review URL: https://codereview.chromium.org/1248503004