Fix PR11985

- BlockAddress has no support of BA + offset form and there is no way to
  propagate that offset into machine operand;
- Add BA + offset support and a new interface 'getTargetBlockAddress' to
  simplify target block address forming;
- All targets are modified to use new interface and X86 backend is enhanced to
  support BA + offset addressing.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163743 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/InstrEmitter.cpp

@@ -410,6 +410,7 @@ void InstrEmitter::AddOperand(MachineInstr *MI, SDValue Op,
                                             ES->getTargetFlags()));
   } else if (BlockAddressSDNode *BA = dyn_cast<BlockAddressSDNode>(Op)) {
     MI->addOperand(MachineOperand::CreateBA(BA->getBlockAddress(),
+                                            BA->getOffset(),
                                             BA->getTargetFlags()));
   } else if (TargetIndexSDNode *TI = dyn_cast<TargetIndexSDNode>(Op)) {
     MI->addOperand(MachineOperand::CreateTargetIndex(TI->getIndex(),