[llvm] [SystemZ] Add check for INIT_UNDEF in getInstSizeInBytes (PR #134661)

[Ulrich Weigand via llvm-commits]

uweigand wrote:

We probably should be more generic here and check for `isMetaInstruction`, which would also cover some of the existing special cases.   However, `INIT_UNDEF` isn't currently even marked as `isMeta` - probably it should be, though.

https://github.com/llvm/llvm-project/pull/134661