Merge experimental/gc branch to the bleeding_edge.

src/lithium-allocator.cc

Index: src/lithium-allocator.cc
===================================================================
--- src/lithium-allocator.cc	(revision 9327)
+++ src/lithium-allocator.cc	(working copy)
@@ -1043,11 +1043,13 @@
       // it into a location different from the operand of a live range
       // covering a branch instruction.
       // Thus we need to manually record a pointer.
-      if (phi->representation().IsTagged()) {
-        LInstruction* branch =
-            InstructionAt(cur_block->last_instruction_index());
-        if (branch->HasPointerMap()) {
+      LInstruction* branch =
+          InstructionAt(cur_block->last_instruction_index());
+      if (branch->HasPointerMap()) {
+        if (phi->representation().IsTagged()) {
           branch->pointer_map()->RecordPointer(phi_operand);
+        } else if (!phi->representation().IsDouble()) {
+          branch->pointer_map()->RecordUntagged(phi_operand);
         }
       }
     }
@@ -1142,10 +1144,13 @@
         // it into a location different from the operand of a live range
         // covering a branch instruction.
         // Thus we need to manually record a pointer.
-        if (HasTaggedValue(range->id())) {
-          LInstruction* branch = InstructionAt(pred->last_instruction_index());
-          if (branch->HasPointerMap()) {
+        LInstruction* branch = InstructionAt(pred->last_instruction_index());
+        if (branch->HasPointerMap()) {
+          if (HasTaggedValue(range->id())) {
             branch->pointer_map()->RecordPointer(cur_op);
+          } else if (!cur_op->IsDoubleStackSlot() &&
+                     !cur_op->IsDoubleRegister()) {
+            branch->pointer_map()->RemovePointer(cur_op);
           }
         }
       }