Roll third_party/SwiftShader 694e21400ee5..b798cfa374eb (9 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/694e21400ee5..b798cfa374eb

git log 694e21400ee5..b798cfa374eb --date=short --first-parent --format='%ad %ae %s'
2020-05-02 capn@google.com Enable the shaderStorageImageArrayDynamicIndexing feature
2020-05-02 capn@google.com Enable the shaderStorageBufferArrayDynamicIndexing feature
2020-05-02 capn@google.com Enable the shaderSampledImageArrayDynamicIndexing feature
2020-05-02 capn@google.com Enable the shaderUniformBufferArrayDynamicIndexing feature
2020-05-02 capn@google.com Implement dynamic descriptor array indexing
2020-05-02 capn@google.com Skip image sampling if no SIMD lanes are active
2020-05-01 capn@google.com Move the OFFSET() macro to Reactor
2020-05-01 amaiorano@google.com Regres: use Subzero backend by default
2020-04-30 bclayton@google.com Update Marl to 3c643dd4c

Created with:
  gclient setdep -r third_party/SwiftShader@b798cfa374

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-angle-autoroll
Please CC cnorthrop@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

Bug: angleproject:4071
Tbr: cnorthrop@google.com
Change-Id: I0b3b71fae13c055a352a87fac5a2f65ddb903f6a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2178983
Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -191,7 +191,7 @@ deps = {
   },
 
   'third_party/SwiftShader': {
-    'url': '{swiftshader_git}/SwiftShader@694e21400ee5dcdc1e5f9458464c9d6788367886',
+    'url': '{swiftshader_git}/SwiftShader@b798cfa374ebfaa04d08458b277f6c499a16b527',
     'condition': 'not build_with_chromium',
   },