Fix and re-enable test-api/InitializeAndDispose.

src/compiler/instruction.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/instruction.h"
 
 #include "src/compiler/common-operator.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 57 matching lines @@
   cache = new SubKindOperand[kNumCachedOperands];
   for (int i = 0; i < kNumCachedOperands; i++) {
     cache[i].ConvertTo(kOperandKind, i);
   }
 }
 
 
 template <InstructionOperand::Kind kOperandKind, int kNumCachedOperands>
 void SubKindOperand<kOperandKind, kNumCachedOperands>::TearDownCache() {
   delete[] cache;
+  cache = NULL;
 }
 
 
 void InstructionOperand::SetUpCaches() {
 #define INSTRUCTION_OPERAND_SETUP(name, type, number) \
   name##Operand::SetUpCache();
   INSTRUCTION_OPERAND_LIST(INSTRUCTION_OPERAND_SETUP)
 #undef INSTRUCTION_OPERAND_SETUP
 }
 
@@ skipping 386 matching lines @@
       os << " B" << (*iter)->id();
     }
     os << "\n";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8