[llvm] [LLVM][ARM] Latency mutations for cortex m55, m7 and m85 (PR #115153)

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

I worry that the allocation but not freeing the data will trip up some sanatizers. We might want to rewrite this so that we avoid the table entirely, just checking for the opcodes/data we need on the instructions directly.

If we ned that we can rewrite it, lets see. Otherwise this LGTM.

https://github.com/llvm/llvm-project/pull/115153