Move some heap verification code in under the --verify-heap flag to speed

src/store-buffer.cc

Index: src/store-buffer.cc
===================================================================
--- src/store-buffer.cc	(revision 9765)
+++ src/store-buffer.cc	(working copy)
@@ -390,20 +390,20 @@
 
 void StoreBuffer::Verify() {
 #ifdef DEBUG
-  if (FLAG_enable_slow_asserts || FLAG_verify_heap) {
-    VerifyPointers(heap_->old_pointer_space(),
-                   &StoreBuffer::FindPointersToNewSpaceInRegion);
-    VerifyPointers(heap_->map_space(),
-                   &StoreBuffer::FindPointersToNewSpaceInMapsRegion);
-    VerifyPointers(heap_->lo_space());
-  }
+  VerifyPointers(heap_->old_pointer_space(),
+                 &StoreBuffer::FindPointersToNewSpaceInRegion);
+  VerifyPointers(heap_->map_space(),
+                 &StoreBuffer::FindPointersToNewSpaceInMapsRegion);
+  VerifyPointers(heap_->lo_space());
 #endif
 }
 
 
 void StoreBuffer::GCEpilogue() {
   during_gc_ = false;
-  Verify();
+  if (FLAG_verify_heap) {
+    Verify();
+  }
 }