[MachineInstr] Get rid of some GlobalISel ifdefs.

Now the type API is always available, but when global-isel is not
built the implementation does nothing.

Note: The implementation free of ifdefs is WIP and tracked here in PR26576.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262873 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed