Roll DirectX Shader Compiler from 7a8c90cf4c44 to 39f1dc165ca3 (2 revisions)

https://chromium.googlesource.com/external/github.com/microsoft/DirectXShaderCompiler.git/+log/7a8c90cf4c44..39f1dc165ca3

2025-08-20 jbatista@microsoft.com Update CMake variable so that dxcapi.use.cpp is detected regardless of root dir (#7709)
2025-08-18 jbatista@microsoft.com Create new class to handle external validation, and rename existing dll loading class. (#7514)

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: I3c8663888d3c04a7960b9a8753339feda6f9f4d5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/258283
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 e48d9ce..c92ea59 100644
--- a/DEPS
+++ b/DEPS
@@ -341,7 +341,7 @@
   },
 
   'third_party/dxc': {
-    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@7a8c90cf4c4418f28c2b6d55f61421096f4c9165',
+    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@39f1dc165ca38e7548d74eaad88d5ee47f1de5a6',
   },
 
   'third_party/dxheaders': {
diff --git a/third_party/dxc b/third_party/dxc
index 7a8c90c..39f1dc1 160000
--- a/third_party/dxc
+++ b/third_party/dxc
@@ -1 +1 @@
-Subproject commit 7a8c90cf4c4418f28c2b6d55f61421096f4c9165
+Subproject commit 39f1dc165ca38e7548d74eaad88d5ee47f1de5a6