Roll SwiftShader d0a4800..155f802

https://swiftshader.googlesource.com/SwiftShader.git/+log/d0a4800..155f802

BUG=

TBR=kbr@chromium.org

TEST=bots

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

Change-Id: I54f31ce39913d0956b5893daf3937a4f1a2c06e3
Reviewed-on: https://chromium-review.googlesource.com/c/1315167Reviewed-by: Alexis Hétu <sugoi@chromium.org>
Commit-Queue: Nicolas Capens <capn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604940}

DEPS

@@ -136,7 +136,7 @@ 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': 'd0a4800e1487cdd65dc9c812ebc39fd2cb0d43b8',
+  'swiftshader_revision': '155f802a6be3720a0176bc1674b5af3b5b6e31f9',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.