Roll SwiftShader from 78cfdcddd8c7 to b1bf623ee5ad (2 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/78cfdcddd8c7..b1bf623ee5ad

2022-09-01 capn@google.com Add a reference implementation for frexp()
2022-09-01 swiftshader.regress@gmail.com Regres: Update test lists @ f0db6df9

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 bajones@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: bajones@google.com
Change-Id: I6b173702c22d1881a909d5b4dd37015bc5cada75
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/101022
Kokoro: Kokoro <noreply+kokoro@google.com>
Bot-Commit: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -134,7 +134,7 @@ deps = {
   },
 
   'third_party/swiftshader': {
-    'url': '{swiftshader_git}/SwiftShader@78cfdcddd8c77a7620adf5db9296a81bcde225aa',
+    'url': '{swiftshader_git}/SwiftShader@b1bf623ee5ad028ca9555738b7f4a0f20bed82b4',
     'condition': 'dawn_standalone',
   },