Auto merge of #137661 - nikic:llvm20-rc3, r=cuviper
Update to LLVM 20 rc 3 Fixes a compiler-builtins miscompile (see https://github.com/rust-lang/compiler-builtins/pull/760).
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Update to LLVM 20 rc 3 Fixes a compiler-builtins miscompile (see https://github.com/rust-lang/compiler-builtins/pull/760).