[llvm] [ADT] Add implementations for mulhs and mulhu to APInt (PR #84609)

[Jakub Kuderski via llvm-commits]

https://github.com/kuhar commented:

Nice! We have a few more places in mli that could be switched to this:
https://github.com/llvm/llvm-project/blob/110141b37813dc48af33de5e1407231e56acdfc5/mlir/lib/Dialect/SPIRV/IR/SPIRVCanonicalization.cpp#L251-L264
https://github.com/llvm/llvm-project/blob/110141b37813dc48af33de5e1407231e56acdfc5/mlir/lib/Dialect/Arith/IR/ArithOps.cpp#L430-L445
https://github.com/llvm/llvm-project/blob/110141b37813dc48af33de5e1407231e56acdfc5/mlir/lib/Dialect/Arith/IR/ArithOps.cpp#L487-L502


https://github.com/llvm/llvm-project/pull/84609