Handle "Mov" which is mov, movss, movsd, and used for nacl.read.tp.

src/IceTargetLoweringX8632.cpp

 //===- subzero/src/IceTargetLoweringX8632.cpp - x86-32 lowering -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the TargetLoweringX8632 class, which
@@ skipping 1040 matching lines @@
   }
   if (OperandX8632Mem *Mem = llvm::dyn_cast<OperandX8632Mem>(Operand)) {
     Constant *Offset = Mem->getOffset();
     if (Offset == NULL)
       Offset = Ctx->getConstantInt32(IceType_i32, 4);
     else if (ConstantInteger32 *IntOffset =
                  llvm::dyn_cast<ConstantInteger32>(Offset)) {
       Offset = Ctx->getConstantInt32(IceType_i32, 4 + IntOffset->getValue());
     } else if (ConstantRelocatable *SymOffset =
                    llvm::dyn_cast<ConstantRelocatable>(Offset)) {
+      assert(!Utils::WouldOverflowAdd(SymOffset->getOffset(), 4));
       Offset = Ctx->getConstantSym(IceType_i32, 4 + SymOffset->getOffset(),
                                    SymOffset->getName());
     }
     return OperandX8632Mem::create(Func, IceType_i32, Mem->getBase(), Offset,
                                    Mem->getIndex(), Mem->getShift(),
                                    Mem->getSegmentRegister());
   }
   llvm_unreachable("Unsupported operand type");
   return NULL;
 }
@@ skipping 3453 matching lines @@
   } else if (IsConstant || IsExternal)
     Str << "\t.zero\t" << Size << "\n";
   // Size is part of .comm.
 
   if (IsConstant || HasInitializer || IsExternal)
     Str << "\t.size\t" << MangledName << ", " << Size << "\n";
   // Size is part of .comm.
 }
 
 } // end of namespace Ice