R600/SI: Don't set patterns for chip-specific instructions while having pseudos

Only pseudos have patterns on them.

Also don't set the asm string for VINTRP_Pseudo. All pseudos should have empty
asm.

This matches what all other multiclasses do.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227212 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed