Roll DirectX Shader Compiler from 396ff2854634 to a67159612e5c (4 revisions)

https://chromium.googlesource.com/external/github.com/microsoft/DirectXShaderCompiler.git/+log/396ff2854634..a67159612e5c

2025-09-10 damyanp@microsoft.com LongVectors: rearrange and tidy up code (#7748)
2025-09-10 ascoleman@microsoft.com [SM6.9] Lower vector dot calls to vector op (#7730)
2025-09-10 clucie@google.com [SPIR-V]: Fix spirv codegen for `uabs` intrinsic when argument is unsigned. (#7750)
2025-09-10 spall@planetbauer.com Add/Update HLK tests for IsSpecialFloat Ops (#7743)

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 jrprice@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: jrprice@google.com
Change-Id: Ic83e11b096dfa8c856795ba9922325762b33af2c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/261456
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 3aacea5..43b026e 100644
--- a/DEPS
+++ b/DEPS
@@ -349,7 +349,7 @@
   },
 
   'third_party/dxc': {
-    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@396ff2854634e400c0918ed7d0621926c0392ca1',
+    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@a67159612e5ceb73d4bba656ce046ab3cf32554d',
   },
 
   'third_party/dxheaders': {
diff --git a/third_party/dxc b/third_party/dxc
index 396ff28..a671596 160000
--- a/third_party/dxc
+++ b/third_party/dxc
@@ -1 +1 @@
-Subproject commit 396ff2854634e400c0918ed7d0621926c0392ca1
+Subproject commit a67159612e5ceb73d4bba656ce046ab3cf32554d