Roll SwiftShader from 3b9a1a795f1e to b46b97c10c10 (4 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/3b9a1a795f1e..b46b97c10c10

2021-05-22 swiftshader.regress@gmail.com Regres: Update test lists @ cbfa971a
2021-05-21 johnstiles@google.com Revert "Fix error in mat4x2(scalar) construction."
2021-05-21 capn@google.com Update llvm::ConstantVector::getSplat() usage to take ElementCount
2021-05-21 srisser@google.com Make fragDepth clamping conditional

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 jlavrova@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/+doc/master/autoroll/README.md

Cq-Include-Trybots: skia/skia.primary:Test-Debian10-Clang-GCE-GPU-SwiftShader-x86_64-Debug-All-SwiftShader
Bug: None
Tbr: jlavrova@google.com
Change-Id: I8184d81e2411b0edc70fd7ba313c3f06ed11bb5b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/411329
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 b649a1f..500bcdf 100644
--- a/DEPS
+++ b/DEPS
@@ -43,7 +43,7 @@
   "third_party/externals/spirv-cross"     : "https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Cross@bdbef7b1f3982fe99a62d076043036abe6dd6d80",
   "third_party/externals/spirv-headers"   : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Headers.git@bcf55210f13a4fa3c3d0963b509ff1070e434c79",
   "third_party/externals/spirv-tools"     : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git@5d8c40399e1a483c168246215e4637e19551cd4f",
-  "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@3b9a1a795f1e46862973f145627ce71fb49a16d2",
+  "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@b46b97c10c10fbd5dc0ff1d1d101839cbc76a995",
   #"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@f49c38202914c289621f547ff016e5f02c994dda",
   "third_party/externals/zlib"            : "https://chromium.googlesource.com/chromium/src/third_party/zlib@c876c8f87101c5a75f6014b0f832499afeb65b73",