Auto merge of #149851 - dianqk:update-llvm, r=cuviper

Update LLVM submodule

Fixes rust-lang/rust#149250.

Update LLVM to 21.1.7 with some 21.1.8 patches. These patches have been backported to release/21.x.
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2025-12-15 07:05:49 +00:00