[llvm] [HEXAGON] AddrModeOpt support for HVX and optimize adds (PR #106368)

[Nathan Chancellor via llvm-commits]

nathanchance wrote:

This appears to resolve the compile time impact for me. Just running `make` to build that one `.o` file takes over 9 minutes before this change and after this change, it only takes 30 seconds. Thanks a lot for the fix!

https://github.com/llvm/llvm-project/pull/106368