Fix bug in edge case in populating PointerMaps

src/lithium-allocator.cc

Index: src/lithium-allocator.cc
diff --git a/src/lithium-allocator.cc b/src/lithium-allocator.cc
index 99dd874d20f262e476616558c442af3a4a9b7790..9c1a6462138d800adcf38a978901d4727c04896f 100644
--- a/src/lithium-allocator.cc
+++ b/src/lithium-allocator.cc
@@ -1418,7 +1418,7 @@ void LAllocator::PopulatePointerMaps() {
       LifetimePosition safe_point_pos =
           LifetimePosition::FromInstructionIndex(safe_point);
       LiveRange* cur = range;
-      while (cur != NULL && !cur->Covers(safe_point_pos.PrevInstruction())) {
+      while (cur != NULL && !cur->Covers(safe_point_pos)) {
         cur = cur->next();
       }
       if (cur == NULL) continue;