MachineInstr: Print name for subreg index in SUBREG_TO_REG

SUBREG_TO_REG takes a subregister index as 3rd operand, print the name
instead of a number. We already do the same for INSERT_SUBREG and
REG_SEQUENCE.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291481 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed