Added mutation of locals to debugger

src/frames.cc

Index: src/frames.cc
===================================================================
--- src/frames.cc	(revision 2164)
+++ src/frames.cc	(working copy)
@@ -457,6 +457,13 @@
 }
 
 
+void JavaScriptFrame::SetParameter(int index, Object* value) {
+  ASSERT(index >= 0 && index < ComputeParametersCount());
+  const int offset = JavaScriptFrameConstants::kParam0Offset;
+  Memory::Object_at(caller_sp() + offset - (index * kPointerSize)) = value;
+}
+
+
 int JavaScriptFrame::ComputeParametersCount() const {
   Address base  = caller_sp() + JavaScriptFrameConstants::kReceiverOffset;
   Address limit = fp() + JavaScriptFrameConstants::kSavedRegistersOffset;
@@ -480,6 +487,13 @@
 }
 
 
+Address JavaScriptFrame::GetParameterAddress(int n) const {
+  ASSERT(n >= 0 && n < ComputeParametersCount());
+  const int offset = JavaScriptFrameConstants::kParam0Offset;
+  return caller_sp() + offset - (n * kPointerSize);
+}
+
+
 Code* ArgumentsAdaptorFrame::code() const {
   return Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline);
 }