[llvm] [llvm-dlltool] Handle MIPS architecture (PR #114621)

[Hervé Poussineau via llvm-commits]

hpoussin wrote:

binutils `dlltool` only supports `i386`, `i386:x86-64`, `arm`, `thumb`, `arm64`, `arm-wince`, `arm_internetwork`, `mcore-be`, `mcore-le`, `mcore-elf-be` and `mcore-elf-le`.
It also supported once `ppc` (removed), `arm-epoc` (removed), `mcore` (renamed to `mcore-be`) and `mcore-elf` (renamed to `mcore-elf-be`)

`llvm-binutils` currently supports `i386`, `i386:x86-64`, `arm`, `arm64` and `arm64ec`.

`mips` name may fit in this list, with `mips16` and `mipsv2` later, or `mips-wince` for the Windows CE variant.


https://github.com/llvm/llvm-project/pull/114621