AMDGPU: Fix breaking VOP3 v_add_i32s

This was shrinking the instruction even though the carry output
register was a virtual register, not known VCC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291716 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed