LLT() has a particular meaning: it's one invalid type. But we really want selected instructions to have no type whatsoever. Also verify that types don't linger after ISel, and enable the verifier on the AArch64 select test. llvm-svn: 277001
And implement it for AArch64, supporting x/w ADD/OR. Differential Revision: https://reviews.llvm.org/D22373 llvm-svn: 276875