Roll DirectX Shader Compiler from 0bdd15b75f83 to a6f402595727 (2 revisions)

https://chromium.googlesource.com/external/github.com/microsoft/DirectXShaderCompiler.git/+log/0bdd15b75f83..a6f402595727

2024-05-22 grroth@microsoft.com Calculate preferred alignment when lowering groupshared matrices (#6589)
2024-05-22 stevenperron@google.com Fix aligment for empty structs (#6635)

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

To file a bug in DirectX Shader Compiler: https://github.com/microsoft/DirectXShaderCompiler/issues/new/choose
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://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Bug: None
Tbr: bajones@google.com
Change-Id: I16b73c774aaeea03508e195eb7ceea52ed8dfdf2
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/189580
Bot-Commit: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index a337d32..4a0ed10 100644
--- a/DEPS
+++ b/DEPS
@@ -287,7 +287,7 @@
   },
 
   'third_party/dxc': {
-    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@0bdd15b75f8390f1dd79887e34d26b4acd5224ba',
+    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@a6f4025957270d12d10b2932e68ca384c5a05f61',
   },
 
   'third_party/dxheaders': {
diff --git a/third_party/dxc b/third_party/dxc
index 0bdd15b..a6f4025 160000
--- a/third_party/dxc
+++ b/third_party/dxc
@@ -1 +1 @@
-Subproject commit 0bdd15b75f8390f1dd79887e34d26b4acd5224ba
+Subproject commit a6f4025957270d12d10b2932e68ca384c5a05f61