[llvm] [CodeGen][ARM64EC] Add support for hybrid_patchable attribute. (PR #92965)

[Jacek Caban via llvm-commits]

cjacek wrote:

Thanks for the review. The new version uses DenseMap, removes redundant null check and bitcasts and adds a comment explaining the gap.

BTW, for anti-dep aliases, I'm still unsure if I'm missing something, but the only general differences from weak aliases I spot so far is that it's legal to have them defined multiple time and if regular weak alias is present, it overrides anti-deps. Other than that, there is a very specific case where linker seems to use that to detect unmangled -> mangled alias and apply some special-casing.

https://github.com/llvm/llvm-project/pull/92965