Subzero. Fix CfgLocalAllocator bug.

src/IceCfg.cpp

 //===- subzero/src/IceCfg.cpp - Control flow graph implementation ---------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 15 matching lines @@
 #include "IceLiveness.h"
 #include "IceLoopAnalyzer.h"
 #include "IceOperand.h"
 #include "IceTargetLowering.h"
 
 namespace Ice {
 
 Cfg::Cfg(GlobalContext *Ctx, uint32_t SequenceNumber)
     : Ctx(Ctx), SequenceNumber(SequenceNumber),
       VMask(Ctx->getFlags().getVerbose()), NextInstNumber(Inst::NumberInitial),
-      Allocator(new ArenaAllocator()), Live(nullptr),
-      Target(TargetLowering::createLowering(Ctx->getFlags().getTargetArch(),
-                                            this)),
-      VMetadata(new VariablesMetadata(this)),
-      TargetAssembler(Target->createAssembler()) {
+      Live(nullptr) {
+  Allocator.reset(new ArenaAllocator());
+  CfgLocalAllocatorScope _(this);
+  Target =
+      TargetLowering::createLowering(Ctx->getFlags().getTargetArch(), this);
+  VMetadata.reset(new VariablesMetadata(this));
+  TargetAssembler = Target->createAssembler();
+
   if (Ctx->getFlags().getRandomizeAndPoolImmediatesOption() == RPI_Randomize) {
     // If -randomize-pool-immediates=randomize, create a random number
     // generator to generate a cookie for constant blinding.
     RandomNumberGenerator RNG(Ctx->getFlags().getRandomSeed(),
                               RPE_ConstantBlinding, this->SequenceNumber);
     ConstantBlindingCookie =
         (uint32_t)RNG.next((uint64_t)std::numeric_limits<uint32_t>::max() + 1);
   }
 }
 
@@ skipping 1078 matching lines @@
     }
   }
   // Print each basic block
   for (CfgNode *Node : Nodes)
     Node->dump(this);
   if (isVerbose(IceV_Instructions))
     Str << "}\n";
 }
 
 } // end of namespace Ice