[turbofan] Various fixes to allow unboxed doubles as arguments in registers and on the stack.

src/compiler/frame.h

Index: src/compiler/frame.h
diff --git a/src/compiler/frame.h b/src/compiler/frame.h
index 2850a8c1a152e74f287bbf60129bf71e2109a9b5..f901b1e2b3402bc662023b1618cefa4702cc7cc5 100644
--- a/src/compiler/frame.h
+++ b/src/compiler/frame.h
@@ -22,7 +22,8 @@ class Frame : public ZoneObject {
         spill_slot_count_(0),
         osr_stack_slot_count_(0),
         allocated_registers_(NULL),
-        allocated_double_registers_(NULL) {}
+        allocated_double_registers_(NULL),
+        pc_on_stack_(true) {}
 
   inline int GetSpillSlotCount() { return spill_slot_count_; }
 
@@ -71,12 +72,17 @@ class Frame : public ZoneObject {
     spill_slot_count_ = static_cast<int>(slot_count);
   }
 
+  void SetPCOnStack(bool val) { pc_on_stack_ = val; }
+
+  int PCOnStackSize() { return pc_on_stack_ ? kRegisterSize : 0; }
+
  private:
   int register_save_area_size_;
   int spill_slot_count_;
   int osr_stack_slot_count_;
   BitVector* allocated_registers_;
   BitVector* allocated_double_registers_;
+  bool pc_on_stack_;
 
   DISALLOW_COPY_AND_ASSIGN(Frame);
 };