Roll DirectX Shader Compiler from 60e6c76fbad9 to b646ad39c722 (1 revision)

https://chromium.googlesource.com/external/github.com/microsoft/DirectXShaderCompiler.git/+log/60e6c76fbad9..b646ad39c722

2025-03-21 stevenperron@google.com [SPIRV] Update submodules and fix test (#7243)

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 senorblanco@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: senorblanco@google.com
Change-Id: I15244b1283d0b1b777134d1db6fca6b8f288e29a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/232137
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index 9592dfb..b8a39df 100644
--- a/DEPS
+++ b/DEPS
@@ -345,7 +345,7 @@
   },
 
   'third_party/dxc': {
-    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@60e6c76fbad97dd0137385289498dc76ffe7b611',
+    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@b646ad39c722a43b39d2df4a80d5f118d85a8685',
   },
 
   'third_party/dxheaders': {
diff --git a/third_party/dxc b/third_party/dxc
index 60e6c76..b646ad3 160000
--- a/third_party/dxc
+++ b/third_party/dxc
@@ -1 +1 @@
-Subproject commit 60e6c76fbad97dd0137385289498dc76ffe7b611
+Subproject commit b646ad39c722a43b39d2df4a80d5f118d85a8685