Roll SwiftShader from 44660405ea6c to dcfc0a6e2d84 (6 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/44660405ea6c..dcfc0a6e2d84

2021-08-02 capn@google.com Fix ignoring fragment shader depth for EarlyFragmentTests mode
2021-08-02 capn@google.com Include multisample handling into fragment pipeline stages
2021-08-02 capn@google.com Only process active fragment samples
2021-08-02 capn@google.com Refactor sample shading state determination
2021-08-02 srisser@google.com Add Bias and Fetch to divergent Lod sampling
2021-08-02 srisser@google.com Optimize Lod and Grad texture sampling

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

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: syoussefi@google.com
Change-Id: I03ec6fa5deb5cceb50786f835101d48ece5e6d9e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3068651
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -491,7 +491,7 @@ deps = {
   },
 
   'third_party/SwiftShader': {
-    'url': '{swiftshader_git}/SwiftShader@44660405ea6ce02683617cc483aecc080499aa27',
+    'url': '{swiftshader_git}/SwiftShader@dcfc0a6e2d8440695e44745126747e4c8aed6cf6',
     'condition': 'not build_with_chromium',
   },