Roll SwiftShader 1fa2067..20eea3c

https://swiftshader.googlesource.com/SwiftShader.git/+log/1fa2067..20eea3c

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;master.tryserver.chromium.linux:linux_chromium_cfi_rel_ng;luci.chromium.try:android_optional_gpu_tests_rel

Change-Id: I7b790c182a42018424f4d34f9fb2a87cb7edf65c
Reviewed-on: https://chromium-review.googlesource.com/1108341Reviewed-by: Alexis Hétu <sugoi@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569054}

DEPS

@@ -125,7 +125,7 @@ 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': '1fa20678010892b3b531e7449f25079868dfba45',
+  'swiftshader_revision': '20eea3cd3b2d64e1b8f9811824cb41cacd09389c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.