SubZero: Correct parenthesis for mem operands with labels in MIPS32

src/IceInstMIPS32.cpp

 //===- subzero/src/IceInstMips32.cpp - Mips32 instruction implementation --===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 /// \file
@@ skipping 263 matching lines @@
   Str << "[MIPS32] ";
   Inst::dump(Func);
 }
 
 void OperandMIPS32Mem::emit(const Cfg *Func) const {
   if (!BuildDefs::dump())
     return;
   Ostream &Str = Func->getContext()->getStrEmit();
   Operand *Offset = getOffset();
   if (auto *CR = llvm::dyn_cast<ConstantRelocatable>(Offset)) {
+    Str << "(";
     CR->emitWithoutPrefix(Func->getTarget());
+    Str << ")";
   } else
     Offset->emit(Func);
   Str << "(";
   getBase()->emit(Func);
   Str << ")";
 }
 
 void InstMIPS32::emitUnaryopGPR(const char *Opcode, const InstMIPS32 *Inst,
                                 const Cfg *Func) {
   if (!BuildDefs::dump())
@@ skipping 378 matching lines @@
     getSrc(0)->emit(Func);
     return;
   }
 
   // stack to stack
   llvm::report_fatal_error("mov cant copy stack to stack.");
 }
 
 } // end of namespace MIPS32
 } // end of namespace Ice