Fix initialization of allocation timeout value.

The allocation timeout value should not be initialized to 0, that
triggers a collection at the first allocation which breaks assumptions
for some test cases.

R=ricow@chromium.org
TEST=cctest/test-heap/Iteration

Review URL: http://codereview.chromium.org/8275032

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9748 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap.cc

@@ -5365,6 +5365,7 @@ class HeapDebugUtils {
 
 bool Heap::Setup(bool create_heap_objects) {
 #ifdef DEBUG
+  allocation_timeout_ = FLAG_gc_interval;
   debug_utils_ = new HeapDebugUtils(this);
 #endif