Expand the x86 V_SET0* pseudos right after register allocation.

This also makes it possible to reduce the number of pseudo instructions
and get rid of the encoding information.

llvm-svn: 140776
diff --git a/llvm/lib/Target/X86/X86InstrInfo.h b/llvm/lib/Target/X86/X86InstrInfo.h
index 0f40222..97009db 100644
--- a/llvm/lib/Target/X86/X86InstrInfo.h
+++ b/llvm/lib/Target/X86/X86InstrInfo.h
@@ -247,6 +247,9 @@
                                MachineInstr::mmo_iterator MMOBegin,
                                MachineInstr::mmo_iterator MMOEnd,
                                SmallVectorImpl<MachineInstr*> &NewMIs) const;
+
+  virtual bool expandPostRAPseudo(MachineBasicBlock::iterator MI) const;
+
   virtual
   MachineInstr *emitFrameIndexDebugValue(MachineFunction &MF,
                                          int FrameIx, uint64_t Offset,