Improve SkARGB32_A8_BlitMask_SSE2

With clang this:

-       movzbl  -3(%rbx), %edx
-       pxor    %xmm5, %xmm5
-       pinsrw  $0, %edx, %xmm5
-       pinsrw  $1, %edx, %xmm5
-       movzbl  -2(%rbx), %edx
-       pinsrw  $2, %edx, %xmm5
-       pinsrw  $3, %edx, %xmm5
-       movzbl  -1(%rbx), %edx
-       pinsrw  $4, %edx, %xmm5
-       pinsrw  $5, %edx, %xmm5
-       movzbl  (%rbx), %edx
-       pinsrw  $6, %edx, %xmm5
-       pinsrw  $7, %edx, %xmm5

becomes:

+       movd    (%rbx), %xmm4
+       punpcklbw       %xmm9, %xmm4
+       punpcklwd       %xmm4, %xmm4

And clang already does better codegen than msvc 2013 on this.

BUG=skia:

Review URL: https://codereview.chromium.org/609823003

1 files changed, 1 insertions, 0 deletions

diff --git a/AUTHORS b/AUTHORS
index c8827a5532..ed4c657e02 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -15,6 +15,7 @@ ACCESS CO., LTD. <*@access-company.com>
 ARM <*@arm.com>
 Ehsan Akhgari <ehsan.akhgari@gmail.com>
 George Wright <george@mozilla.com>
+Jeff Muizelaar <jmuizelaar@mozilla.com>
 Google Inc. <*@google.com>
 Igalia <*@igalia.com>
 Intel <*@intel.com>