Roll third_party/externals/swiftshader 5a5ffe52a944..adb0d51ca672 (7 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/5a5ffe52a944..adb0d51ca672

git log 5a5ffe52a944..adb0d51ca672 --date=short --no-merges --format='%ad %ae %s'
2019-09-13 Tom.Tan@microsoft.com Fix intrinsic of getting timer tick for Windows ARM64
2019-09-12 digit@google.com [memfd] Create support class for Linux memfd-backed region.
2019-09-12 capn@google.com Assert Reactor Float constants are finite
2019-09-12 capn@google.com Fix construction of SPIR-V constant float objects
2019-09-12 capn@google.com Fix passing sampler offset operands unchanged
2019-09-12 capn@google.com Fix storing of non-float SPIR-V constants
2019-09-12 capn@google.com Fix non-float constant creation for ASM

Created with:
  gclient setdep -r third_party/externals/swiftshader@adb0d51ca672

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-skia-autoroll
Please CC mtklein@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

CQ_INCLUDE_TRYBOTS=skia.primary:Test-Debian9-Clang-GCE-GPU-SwiftShader-x86_64-Debug-All-SwiftShader
Bug: None
TBR=mtklein@google.com
Change-Id: Iabe6a58d39aba131093a38fd877b8f3dcc75564d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/241196
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index a63c8cf..6677a9c 100644
--- a/DEPS
+++ b/DEPS
@@ -30,7 +30,7 @@
   "third_party/externals/spirv-cross"     : "https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Cross@53ab2144b90abede33be5161aec5dfc94ddc3caf",
   "third_party/externals/spirv-headers"   : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Headers.git@29c11140baaf9f7fdaa39a583672c556bf1795a1",
   "third_party/externals/spirv-tools"     : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git@0c4feb643b89d1792b02f7cbef315e9d95633bd7",
-  "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@5a5ffe52a944a4068f2297ec404b7b5e9a9b9e03",
+  "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@adb0d51ca672db04e9e524dd17a2f963d3fd3878",
   #"third_party/externals/v8"              : "https://chromium.googlesource.com/v8/v8.git@5f1ae66d5634e43563b2d25ea652dfb94c31a3b4",
   "third_party/externals/wuffs"           : "https://skia.googlesource.com/external/github.com/google/wuffs.git@6ad7d00a262e862549e4963b4a43d148a8285e50",
   "third_party/externals/zlib"            : "https://chromium.googlesource.com/chromium/src/third_party/zlib@47af7c547f8551bd25424e56354a2ae1e9062859",