Remove saving/restoring of the context at function entry.

runtime/vm/debugger_arm.cc

Index: runtime/vm/debugger_arm.cc
===================================================================
--- runtime/vm/debugger_arm.cc	(revision 41422)
+++ runtime/vm/debugger_arm.cc	(working copy)
@@ -13,26 +13,6 @@
 
 namespace dart {
 
-RawInstance* ActivationFrame::GetInstanceCallReceiver(
-                 intptr_t num_actual_args) {
-  ASSERT(num_actual_args > 0);  // At minimum we have a receiver on the stack.
-  // Stack pointer points to last argument that was pushed on the stack.
-  uword receiver_addr = sp() + ((num_actual_args - 1) * kWordSize);
-  return reinterpret_cast<RawInstance*>(
-             *reinterpret_cast<uword*>(receiver_addr));
-}
-
-
-RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) {
-  // At a minimum we have the closure object on the stack.
-  ASSERT(num_actual_args > 0);
-  // Stack pointer points to last argument that was pushed on the stack.
-  uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize);
-  return reinterpret_cast<RawObject*>(
-             *reinterpret_cast<uword*>(closure_addr));
-}
-
-
 uword CodeBreakpoint::OrigStubAddress() const {
   return saved_value_;
 }