https://swiftshader.googlesource.com/SwiftShader.git/+log/aedd133cd85f..149733cead63

2021-01-15 sugoi@google.com Fix crash in vertex shader when position is not declared
2021-01-15 amaiorano@google.com LLVMReactorDebugInfo: fix location filename always "<unknown>" on Windows

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 timvp@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

Bug: None
Tbr: timvp@google.com
Change-Id: Ia6b5f9d4c8b08f513af90e4aea7d3ca6650894c3
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2634923Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>