Remove register counts from VirtualFrame, use register indices instead.

src/virtual-frame-ia32.h

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 58 matching lines @@
   explicit VirtualFrame(VirtualFrame* original);
 
   // Create a duplicate of an existing valid frame element.
   FrameElement CopyElementAt(int index);
 
   // The height of the virtual expression stack.
   int height() const {
     return elements_.length() - expression_base_index();
   }
 
-  int register_count(Register reg) {
-    return frame_registers_.count(reg);
+  int register_index(Register reg) {
+    return register_locations_[reg.code()];
+  }
+
+  bool is_used(int reg_code) {
+    return register_locations_[reg_code] != kIllegalIndex;
+  }
+
+  bool is_used(Register reg) {
+    return is_used(reg.code());
   }
 
   // Add extra in-memory elements to the top of the frame to match an actual
   // frame (eg, the frame after an exception handler is pushed).  No code is
   // emitted.
   void Adjust(int count);
 
   // Forget count elements from the top of the frame all in-memory
   // (including synced) and adjust the stack pointer downward, to
   // match an external frame effect (examples include a call removing
@@ skipping 235 matching lines @@
   int local_count_;
 
   // The index of the element that is at the processor's stack pointer
   // (the esp register).
   int stack_pointer_;
 
   // The index of the element that is at the processor's frame pointer
   // (the ebp register).
   int frame_pointer_;
 
-  // The frame has an embedded register file that it uses to track registers
-  // used in the frame.
-  RegisterFile frame_registers_;
-
   // The index of the register frame element using each register, or
   // kIllegalIndex if a register is not on the frame.
   int register_locations_[kNumRegisters];
 
   // The index of the first parameter.  The receiver lies below the first
   // parameter.
   int param0_index() const { return 1; }
 
   // The index of the context slot in the frame.
   int context_index() const {
@@ skipping 106 matching lines @@
   Result RawCallCodeObject(Handle<Code> code, RelocInfo::Mode rmode);
 
   bool Equals(VirtualFrame* other);
 
   friend class JumpTarget;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_VIRTUAL_FRAME_IA32_H_