Subzero: Make sure alloca with align=0 is handled correctly.

src/IceInst.cpp

 //===- subzero/src/IceInst.cpp - High-level instruction implementation ----===//
 //
 //                        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 Inst class, primarily the various
@@ skipping 516 matching lines @@
 void Inst::dumpDest(const Cfg *Func) const {
   if (getDest())
     getDest()->dump(Func);
 }
 
 void InstAlloca::dump(const Cfg *Func) const {
   Ostream &Str = Func->getContext()->getStrDump();
   dumpDest(Func);
   Str << " = alloca i8, i32 ";
   getSizeInBytes()->dump(Func);
-  Str << ", align " << getAlignInBytes();
+  if (getAlignInBytes())
+    Str << ", align " << getAlignInBytes();
 }
 
 void InstArithmetic::dump(const Cfg *Func) const {
   Ostream &Str = Func->getContext()->getStrDump();
   dumpDest(Func);
   Str << " = " << InstArithmeticAttributes[getOp()].DisplayString << " "
       << getDest()->getType() << " ";
   dumpSources(Func);
 }
 
@@ skipping 213 matching lines @@
 
 void InstTarget::dump(const Cfg *Func) const {
   Ostream &Str = Func->getContext()->getStrDump();
   Str << "[TARGET] ";
   Inst::dump(Func);
 }
 
 void InstTarget::dumpExtras(const Cfg *Func) const { Inst::dumpExtras(Func); }
 
 } // end of namespace Ice