Roll src/third_party/swiftshader 900e1dac1b2d..e899321b0bf7 (7 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/900e1dac1b2d..e899321b0bf7


git log 900e1dac1b2d..e899321b0bf7 --date=short --no-merges --format='%ad %ae %s'
2019-06-24 capn@google.com Refactor remaining cases of memset(this, ...)
2019-06-24 capn@google.com Fix initialization of LRU cache keys
2019-06-24 headlessclayton@gmail.com LLVMReactor: Bind double variants of trig / exp functions
2019-06-24 headlessclayton@gmail.com LLVMReactor: Remove "stack-probe-size" fudge, bind _chkstk extern
2019-06-24 headlessclayton@gmail.com Reactor: Various build fixes for MSVC 2019
2019-06-24 headlessclayton@gmail.com LLVMReactor: Align the coroutine stack frame.
2019-06-24 bclayton@google.com Put LLVM IR verification behind a default-disabled flag


Created with:
  gclient setdep -r src/third_party/swiftshader@e899321b0bf7

The AutoRoll server is located here: https://autoroll.skia.org/r/swiftshader-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

CQ_INCLUDE_TRYBOTS=luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel

BUG=chromium:b/134932616,chromium:b/134932616,chromium:b/126873455,chromium:b/135866359,chromium:b/135691587,chromium:b/135609394
TBR=swiftshader-team+autoroll@google.com

Change-Id: I2785bf27aaba4be9cb43d7f7db3ebf16058b9bd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674214Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#671786}

DEPS

@@ -154,7 +154,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.
-  'swiftshader_revision': '900e1dac1b2da6fae567e8e2da7a36f7b2cbd625',
+  'swiftshader_revision': 'e899321b0bf7f8ebcab4a5b4e562474701829b75',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.