Roll third_party/externals/swiftshader c9625f1660da..b6e8c3f0f483 (7 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/c9625f1660da..b6e8c3f0f483

git log c9625f1660da..b6e8c3f0f483 --date=short --first-parent --format='%ad %ae %s'
2020-05-16 capn@google.com Encapsulate the RValue<T> value field
2020-05-16 capn@google.com Add type-safe Reference<T> load method
2020-05-16 capn@google.com Add type-safe LValue<T> load and store methods
2020-05-16 capn@google.com Retrieve Variable type through an abstract method
2020-05-16 capn@google.com Rename Reactor static getType() methods to type()
2020-05-16 capn@google.com Fix processing OpExecutionMode for the requested entry point
2020-05-15 capn@google.com Regres: Reverse full test run order

Created with:
  gclient setdep -r third_party/externals/swiftshader@b6e8c3f0f483

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 lovisolo@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/skia.primary:Test-Debian10-Clang-GCE-GPU-SwiftShader-x86_64-Debug-All-SwiftShader
Bug: None
Tbr: lovisolo@google.com
Change-Id: I6e8bdad34630e653136b659bb8997683119d78ec
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/290401
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 2bf0335..a81c24d 100644
--- a/DEPS
+++ b/DEPS
@@ -37,7 +37,7 @@
   "third_party/externals/spirv-cross"     : "https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Cross@7e0295abf81cc939ecb2644c88592d77407d18d3",
   "third_party/externals/spirv-headers"   : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Headers.git@c0df742ec0b8178ad58c68cff3437ad4b6a06e26",
   "third_party/externals/spirv-tools"     : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git@e95fbfb1f509ad7a7fdfb72ac35fe412d72fc4a4",
-  "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@c9625f1660da79f403ec40096fd4958febbde70c",
+  "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@b6e8c3f0f4830887d69ba765a922ac3c40e81dd9",
   #"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@4080840928c0b05a80cda0d14ac2e2615f679f1a",
   "third_party/externals/zlib"            : "https://chromium.googlesource.com/chromium/src/third_party/zlib@47af7c547f8551bd25424e56354a2ae1e9062859",