[llvm] [TableGen][DecoderEmitter] Add option to emit type-specialized `decodeToMCInst` (PR #146593)

[Craig Topper via llvm-commits]

topperc wrote:

Can we store the type in the Instruction class in the .td files like the bitwidth instead of introducing a complex command line argument?

https://github.com/llvm/llvm-project/pull/146593