Make TargetInstrInfo::isCopyInstr return true for regular COPY-instructions

..Move all target-dependent checks into new isCopyInstrImpl method.

This change allows us to treat MoveReg-type instructions and generic
COPY instruction in the same way

Differential Revision: https://reviews.llvm.org/D49913



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341072 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed