[turbofan] Spill rsi and rdi in their existing locations.

src/compiler/register-allocator.h

Index: src/compiler/register-allocator.h
diff --git a/src/compiler/register-allocator.h b/src/compiler/register-allocator.h
index 443232abb18f13e929b0aa2a4c7ba5def79285b2..b284fbb5de905fd73bc3096ad959d95296db16c7 100644
--- a/src/compiler/register-allocator.h
+++ b/src/compiler/register-allocator.h
@@ -594,6 +594,14 @@ class TopLevelLiveRange final : public LiveRange {
     splinter->SetSplinteredFrom(this);
   }
 
+  void MarkElidableDef(MoveOperands* move) {

[Jarin, 2015/11/12 12:08:33]

elidable -> elidible (here and elsewhere)

+    DCHECK_NULL(elidable_def_);
+    elidable_def_ = move;
+  }
+
+  MoveOperands* elidable_def() const { return elidable_def_; }
+  bool IsReferenceAccountedByCaller() const { return elidable_def_ != nullptr; }
+
  private:
   void SetSplinteredFrom(TopLevelLiveRange* splinter_parent);
 
@@ -618,6 +626,7 @@ class TopLevelLiveRange final : public LiveRange {
   LiveRange* last_child_;
   UsePosition* last_pos_;
   TopLevelLiveRange* splinter_;
+  MoveOperands* elidable_def_;
 
   DISALLOW_COPY_AND_ASSIGN(TopLevelLiveRange);
 };