Add an elements_.length() accessor to the VirtualFrame class and use...

src/arm/virtual-frame-arm.h

Index: src/arm/virtual-frame-arm.h
===================================================================
--- src/arm/virtual-frame-arm.h	(revision 2033)
+++ src/arm/virtual-frame-arm.h	(working copy)
@@ -82,9 +82,12 @@
   // Create a duplicate of an existing valid frame element.
   FrameElement CopyElementAt(int index);
 
+  // The number of elements on the virtual frame.
+  int element_count() { return elements_.length(); }
+
   // The height of the virtual expression stack.
   int height() {
-    return elements_.length() - expression_base_index();
+    return element_count() - expression_base_index();
   }
 
   int register_index(Register reg) {
@@ -108,7 +111,7 @@
   // the frame after a runtime call).  No code is emitted.
   void Forget(int count) {
     ASSERT(count >= 0);
-    ASSERT(stack_pointer_ == elements_.length() - 1);
+    ASSERT(stack_pointer_ == element_count() - 1);
     stack_pointer_ -= count;
     ForgetElements(count);
   }
@@ -204,7 +207,7 @@
   }
 
   void PushElementAt(int index) {
-    PushFrameSlotAt(elements_.length() - index - 1);
+    PushFrameSlotAt(element_count() - index - 1);
   }
 
   // A frame-allocated local as an assembly operand.
@@ -335,7 +338,7 @@
   void Drop() { Drop(1); }
 
   // Duplicate the top element of the frame.
-  void Dup() { PushFrameSlotAt(elements_.length() - 1); }
+  void Dup() { PushFrameSlotAt(element_count() - 1); }
 
   // Pop an element from the top of the expression stack.  Returns a
   // Result, which may be a constant or a register.
@@ -419,8 +422,8 @@
   // Convert a frame index into a frame pointer relative offset into the
   // actual stack.
   int fp_relative(int index) {
-    ASSERT(index < elements_.length());
-    ASSERT(frame_pointer() < elements_.length());  // FP is on the frame.
+    ASSERT(index < element_count());
+    ASSERT(frame_pointer() < element_count());  // FP is on the frame.
     return (frame_pointer() - index) * kPointerSize;
   }