[qt/clang/llvm]: Summary of bulk changes made

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Git repository change summary for qt/clang/llvm
Pushed by mirror-service into branch 'upstream/users/arsenm/issue154925/clang/amdgpu-use-new-subarch-triples'.
Changed from f820878f31cc57bdb91cc2ef7f2dce87031512d7 to 818c7c50cc00b37ae86fa5b2487fa347778305cc
Acknowledgement was received that this change introduces only existing code that has been pushed to another public open source repository.

This change contains the following new commits:

Git commit 818c7c50cc00b37ae86fa5b2487fa347778305cc by Matt Arsenault on 22/07/2026 at 15:38..
clang: Start using new amdgpu subarch triples

Fixup invocations using --target=amdgcn + -mcpu to introduce
the subarch in the triple.

For offload toolchains, a single toolchain is constructed for the
top level amdgpu architecture, and the effective triple is used for
target specific tool invocations.

The specifics of the resource directory layout are tbd. This does
try to find resources in the subarch named directory. The paths
are searched at toolchain creation time, so that does not work
when there are multiple subarches.

Fixes #154925
https://invent.kde.org/qt/clang/llvm/-/commit/818c7c50cc00b37ae86fa5b2487fa347778305cc
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