First step to cleanup the power-of-2 mess.

src/allocation.cc

 // Copyright 2012 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/allocation.h"
 
 #include <stdlib.h>  // For free, malloc.
+#include "src/base/bits.h"
 #include "src/base/logging.h"
 #include "src/base/platform/platform.h"
 #include "src/utils.h"
 
 #if V8_LIBC_BIONIC
 #include <malloc.h>  // NOLINT
 #endif
 
 namespace v8 {
 namespace internal {
@@ skipping 58 matching lines @@
   int length = StrLength(str);
   if (n < length) length = n;
   char* result = NewArray<char>(length + 1);
   MemCopy(result, str, length);
   result[length] = '\0';
   return result;
 }
 
 
 void* AlignedAlloc(size_t size, size_t alignment) {
-  DCHECK(IsPowerOf2(alignment) && alignment >= V8_ALIGNOF(void*));  // NOLINT
+  DCHECK_LE(V8_ALIGNOF(void*), alignment);
+  DCHECK(base::bits::IsPowerOfTwo32(alignment));
   void* ptr;
 #if V8_OS_WIN
   ptr = _aligned_malloc(size, alignment);
 #elif V8_LIBC_BIONIC
   // posix_memalign is not exposed in some Android versions, so we fall back to
   // memalign. See http://code.google.com/p/android/issues/detail?id=35391.
   ptr = memalign(alignment, size);
 #else
   if (posix_memalign(&ptr, alignment, size)) ptr = NULL;
 #endif
   if (ptr == NULL) FatalProcessOutOfMemory("AlignedAlloc");
   return ptr;
 }
 
 
 void AlignedFree(void *ptr) {
 #if V8_OS_WIN
   _aligned_free(ptr);
 #elif V8_LIBC_BIONIC
   // Using free is not correct in general, but for V8_LIBC_BIONIC it is.
   free(ptr);
 #else
   free(ptr);
 #endif
 }
 
 } }  // namespace v8::internal