Fixing windows build.

"src\store-buffer.cc(72) : warning C4244: 'initializing' : conversion from 'intptr_t' to 'int', possible loss of data"

Review URL: http://codereview.chromium.org/8804003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10146 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/store-buffer.cc

@@ -69,7 +69,7 @@ void StoreBuffer::Setup() {
   // Don't know the alignment requirements of the OS, but it is certainly not
   // less than 0xfff.
   ASSERT((reinterpret_cast<uintptr_t>(old_start_) & 0xfff) == 0);
-  int initial_length = OS::CommitPageSize() / kPointerSize;
+  int initial_length = static_cast<int>(OS::CommitPageSize() / kPointerSize);
   ASSERT(initial_length > 0);
   ASSERT(initial_length <= kOldStoreBufferLength);
   old_limit_ = old_start_ + initial_length;