Roll SwiftShader from 08f12cdc2290 to 8ef6045b0a23 (2 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/08f12cdc2290..8ef6045b0a23

2023-04-07 natsu@google.com Undef i386 builtin to avoid collision with LLVM namespace
2023-04-07 natsu@google.com Remove HAVE_MALLINFO2 from Android LLVM16 config

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-dawn-autoroll
Please CC kainino@google.com,webgpu-developers@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in SwiftShader: https://bugs.chromium.org/p/swiftshader/issues/entry
To file a bug in Dawn: https://bugs.chromium.org/p/dawn/issues/entry

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/main/autoroll/README.md

Bug: None
Tbr: kainino@google.com
Change-Id: I294931b3c5fc903df61fdd620977815d77d6c178
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/126703
Bot-Commit: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -137,7 +137,7 @@ deps = {
   },
 
   'third_party/swiftshader': {
-    'url': '{swiftshader_git}/SwiftShader@08f12cdc2290dfe803f1b1d936c04e08d1b8bdf9',
+    'url': '{swiftshader_git}/SwiftShader@8ef6045b0a23ebc3cc8b08f89a728d1975538f86',
     'condition': 'dawn_standalone',
   },