Auto merge of #106827 - alexcrichton:update-llvm-to-15.0.7, r=cuviper

Update LLVM to 15.0.7

This commit pulls in rust-lang/llvm-project#143 which updates the LLVM version used by rustc to 15.0.7, namely pulling in https://reviews.llvm.org/D136110 which is needed for some work I'm working on with wasm.

Author: bors