Don't redundantly copy implicit operands when rematerializing.

While we're at it - don't copy vreg implicit operands while rematerializing.
This fixes PR12138.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151779 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed