Subzero: Fix a build issue against LLVM trunk.

src/IceTargetLoweringMIPS32.cpp

 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// \brief Implements the TargetLoweringMIPS32 class, which consists almost
@@ skipping 1278 matching lines @@
       }
     }
     Context.insert<InstAssign>(Arg, RegisterArg);
   }
 
   // Insert fake use of ImplicitRet_v4f32 to keep it live
   if (ImplicitRetVec) {
     for (CfgNode *Node : Func->getNodes()) {
       for (Inst &Instr : Node->getInsts()) {
         if (llvm::isa<InstRet>(&Instr)) {
-          Context.setInsertPoint(Instr);
+          Context.setInsertPoint(instToIterator(&Instr));
           Context.insert<InstFakeUse>(ImplicitRetVec);
           break;
         }
       }
     }
   }
 }
 
 Type TargetMIPS32::stackSlotType() { return IceType_i32; }
 
@@ skipping 4666 matching lines @@
     if (auto *CallTargetR = llvm::dyn_cast<Variable>(CallTarget)) {
       Variable *T6 = Target->getPhysicalRegister(RegMIPS32::Reg_T6);
       Target->_and(CallTargetR, CallTargetR, T6);
     }
   }
   return Target->Context.insert<InstMIPS32Call>(ReturnReg, CallTarget);
 }
 
 } // end of namespace MIPS32
 } // end of namespace Ice