Revert "Initial implementation of on-stack replacement (OSR)."

runtime/vm/stack_frame.h

Index: runtime/vm/stack_frame.h
diff --git a/runtime/vm/stack_frame.h b/runtime/vm/stack_frame.h
index e32f242d6b280588ec5924ea6d47b489b1cc80c3..2b206fa5237e08b086c96c0e9c0d0491e9235641 100644
--- a/runtime/vm/stack_frame.h
+++ b/runtime/vm/stack_frame.h
@@ -75,6 +75,7 @@ class StackFrame : public ValueObject {
   // Returns token_pos of the pc(), or -1 if none exists.
   intptr_t GetTokenPos() const;
 
+
  protected:
   StackFrame() : fp_(0), sp_(0), pc_(0) { }
 
@@ -295,3 +296,4 @@ class InlinedFunctionsIterator : public ValueObject {
 }  // namespace dart
 
 #endif  // VM_STACK_FRAME_H_
+