[llvm-branch-commits] [llvm] release/18.x: Prepend all library intrinsics with `#` when building for Arm64EC (PR #88016)

[Daniel Paoliello via llvm-branch-commits]

dpaoliello wrote:

> Hi @dpaoliello (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.

Fixes an issue with Arm64EC code generation where calls to some intrinsics implemented in `compiler-rt` used the wrong name mangling, eventually resulting in unresolved symbol errors during linking.

https://github.com/llvm/llvm-project/pull/88016