enhance new encoder to support prefixes + RawFrm

instructions with no operands.  It can now handle

define void @test2() nounwind { ret void }



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95261 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86CodeEmitter.cpp

@@ -559,7 +559,7 @@ void Emitter<CodeEmitter>::emitInstruction(const MachineInstr &MI,
     // Skip the last source operand that is tied_to the dest reg. e.g. LXADD32
     --NumOps;
 
-  unsigned char BaseOpcode = II->getBaseOpcodeFor(Desc);
+  unsigned char BaseOpcode = X86InstrInfo::getBaseOpcodeFor(*Desc);
   switch (Desc->TSFlags & X86II::FormMask) {
   default:
     llvm_unreachable("Unknown FormMask value in X86 MachineCodeEmitter!");