Merge r10334 from the bleeding_edge to the 3.7 branch.

src/mark-compact.cc

Index: src/mark-compact.cc
===================================================================
--- src/mark-compact.cc	(revision 10356)
+++ src/mark-compact.cc	(working copy)
@@ -3602,14 +3602,6 @@
       continue;
     }
 
-    if (lazy_sweeping_active) {
-      if (FLAG_gc_verbose) {
-        PrintF("Sweeping 0x%" V8PRIxPTR " lazily postponed.\n",
-               reinterpret_cast<intptr_t>(p));
-      }
-      continue;
-    }
-
     // One unused page is kept, all further are released before sweeping them.
     if (p->LiveBytes() == 0) {
       if (unused_page_present) {
@@ -3623,6 +3615,14 @@
       unused_page_present = true;
     }
 
+    if (lazy_sweeping_active) {
+      if (FLAG_gc_verbose) {
+        PrintF("Sweeping 0x%" V8PRIxPTR " lazily postponed.\n",
+               reinterpret_cast<intptr_t>(p));
+      }
+      continue;
+    }
+
     switch (sweeper) {
       case CONSERVATIVE: {
         if (FLAG_gc_verbose) {