[llvm-branch-commits] [llvm] release/18.x: [X86][EVEX512] Check hasEVEX512 for canExtendTo512DQ (#90390) (PR #90422)

[Phoebe Wang via llvm-branch-commits]

phoebewang wrote:

> Hi @phoebewang (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR.

This patch fixes a X86 bug introduced during LLVM18, which crashes when compiling some bit vector with AVX512.

https://github.com/llvm/llvm-project/pull/90422