Roll third_party/SwiftShader 5cf1e9a31c90..cb58662302c8 (7 commits)
Roll third_party/SwiftShader 5cf1e9a31c90..cb58662302c8 (7 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/5cf1e9a31c90..cb58662302c8

git log 5cf1e9a31c90..cb58662302c8 --date=short --first-parent --format='%ad %ae %s'
2020-04-01 cwallez@cwallez-macbookpro3.roam.corp.google.com MetalSurface: set layer.device to a ref of the system default device.
2020-04-01 bclayton@google.com Regres: Add invertCommon optimization.
2020-04-01 bclayton@google.com Regres: Move optimization logic to separate file
2020-04-01 bclayton@google.com Regres: Keep coverage span groups stable.
2020-04-01 bclayton@google.com Regres: Split coverage.go into multiple files
2020-04-01 bclayton@google.com Regres: Further optimizations for coverage
2020-04-01 bclayton@google.com Regres: Add cov.ReadJSON()

Created with:
  gclient setdep -r third_party/SwiftShader@cb58662302c8

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 470c533e86f4f848c98c7e11fffc2d043494a401@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: None
Tbr: 470c533e86f4f848c98c7e11fffc2d043494a401@google.com
Change-Id: I5045b14bd9f36d571dea44a0b5e4c2cdc97dea25
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2133563
Reviewed-by: angle-autoroll <09ea9b8bac6cceb6ec3b72e615745c3a1e982ce2@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <09ea9b8bac6cceb6ec3b72e615745c3a1e982ce2@skia-public.iam.gserviceaccount.com>

ppy/angle,ppy/angle,ppy/angle,ppy/angle