Roll DirectX Shader Compiler from 8480bc6c4e52 to 26bbce370154 (2 revisions)

https://chromium.googlesource.com/external/github.com/microsoft/DirectXShaderCompiler.git/+log/8480bc6c4e52..26bbce370154

2026-01-15 alexsepkowski@gmail.com [NFC][SM 6.9 Release] Missed a version string. (#8062)
2026-01-15 alexsepkowski@gmail.com [NFC][SM6.9 Release] - Add version string to release notes (#8064)

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 amaiorano@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: amaiorano@google.com
Change-Id: Ibdf5a78472df248f664f8751dc8567f36801c696
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/285276
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 8367d7b..91ee8b9 100644
--- a/DEPS
+++ b/DEPS
@@ -355,7 +355,7 @@
   },
 
   'third_party/dxc': {
-    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@8480bc6c4e5231849531e2a6792783d46295a0bc',
+    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@26bbce370154ec4c36bd46c6a85bc62b2cd6ffc2',
   },
 
   'third_party/dxheaders': {
diff --git a/third_party/dxc b/third_party/dxc
index 8480bc6..26bbce3 160000
--- a/third_party/dxc
+++ b/third_party/dxc
@@ -1 +1 @@
-Subproject commit 8480bc6c4e5231849531e2a6792783d46295a0bc
+Subproject commit 26bbce370154ec4c36bd46c6a85bc62b2cd6ffc2