Merge r9606, r9607, and r9609 into 3.6 branch.

src/store-buffer.cc

Index: src/store-buffer.cc
===================================================================
--- src/store-buffer.cc	(revision 9610)
+++ src/store-buffer.cc	(working copy)
@@ -390,11 +390,13 @@
 
 void StoreBuffer::Verify() {
 #ifdef DEBUG
-  VerifyPointers(heap_->old_pointer_space(),
-                 &StoreBuffer::FindPointersToNewSpaceInRegion);
-  VerifyPointers(heap_->map_space(),
-                 &StoreBuffer::FindPointersToNewSpaceInMapsRegion);
-  VerifyPointers(heap_->lo_space());
+  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());
+  }
 #endif
 }