[mlir][LLVM] Add support for `ptrtoaddr` (#185104)
The `ptrtoaddr` op is akin to `ptrtoint` with some important
differences:
* It does not capture the provenance of the pointer, meaning a pointer
does not escape and subsequent `inttoptr` don't make a legal pointer.
LLVM can then assume the pointer never escaped, which helps alias
analysis.
* It does not support arbitrary integer types, but only exactly the
integer type that is equal in width to the pointer type as specified by
the data layout.
This PR adds the op the MLIR dialect and adds the corresponding
verification for the datalayout property.
