Don't explicitly tear down code range in cctest/test-alloc/CodeRange to avoid double-free.

src/heap/spaces.h

 // Copyright 2011 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.
 
 #ifndef V8_HEAP_SPACES_H_
 #define V8_HEAP_SPACES_H_
 
 #include "src/allocation.h"
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
@@ skipping 913 matching lines @@
 class CodeRange {
  public:
   explicit CodeRange(Isolate* isolate);
   ~CodeRange() { TearDown(); }
 
   // Reserves a range of virtual memory, but does not commit any of it.
   // Can only be called once, at heap initialization time.
   // Returns false on failure.
   bool SetUp(size_t requested_size);
 
-  // Frees the range of virtual memory, and frees the data structures used to
-  // manage it.
-  void TearDown();
-
   bool valid() { return code_range_ != NULL; }
   Address start() {
     DCHECK(valid());
     return static_cast<Address>(code_range_->address());
   }
   size_t size() {
     DCHECK(valid());
     return code_range_->size();
   }
   bool contains(Address address) {
     if (!valid()) return false;
     Address start = static_cast<Address>(code_range_->address());
     return start <= address && address < start + code_range_->size();
   }
 
   // Allocates a chunk of memory from the large-object portion of
   // the code range.  On platforms with no separate code range, should
   // not be called.
   MUST_USE_RESULT Address AllocateRawMemory(const size_t requested_size,
                                             const size_t commit_size,
                                             size_t* allocated);
   bool CommitRawMemory(Address start, size_t length);
   bool UncommitRawMemory(Address start, size_t length);
   void FreeRawMemory(Address buf, size_t length);
 
   void ReserveEmergencyBlock();
   void ReleaseEmergencyBlock();
 
  private:
+  // Frees the range of virtual memory, and frees the data structures used to
+  // manage it.
+  void TearDown();
+
   Isolate* isolate_;
 
   // The reserved range of virtual memory that all code objects are put in.
   base::VirtualMemory* code_range_;
   // Plain old data class, just a struct plus a constructor.
   class FreeBlock {
    public:
     FreeBlock() : start(0), size(0) {}
     FreeBlock(Address start_arg, size_t size_arg)
         : start(start_arg), size(size_arg) {
@@ skipping 1874 matching lines @@
     count = 0;
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_SPACES_H_