Remove obsolete {JavaScriptFrame::GetArgumentsLength}.

R=jarin@chromium.org

Change-Id: I07bde35a44734b49e143a6dafa17dd7c20587412
Reviewed-on: https://chromium-review.googlesource.com/795950Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49710}

src/frames.cc

@@ -965,16 +965,6 @@ bool JavaScriptFrame::HasInlinedFrames() const {
 }
 
 
-int JavaScriptFrame::GetArgumentsLength() const {
-  // If there is an arguments adaptor frame get the arguments length from it.
-  if (has_adapted_arguments()) {
-    return ArgumentsAdaptorFrame::GetLength(caller_fp());
-  } else {
-    return GetNumberOfIncomingArguments();
-  }
-}
-
-
 Code* JavaScriptFrame::unchecked_code() const {
   return function()->code();
 }
@@ -1659,11 +1649,6 @@ int ArgumentsAdaptorFrame::GetNumberOfIncomingArguments() const {
   return Smi::ToInt(GetExpression(0));
 }
 
-int ArgumentsAdaptorFrame::GetLength(Address fp) {
-  const int offset = ArgumentsAdaptorFrameConstants::kLengthOffset;
-  return Smi::ToInt(Memory::Object_at(fp + offset));
-}
-
 Code* ArgumentsAdaptorFrame::unchecked_code() const {
   return isolate()->builtins()->builtin(
       Builtins::kArgumentsAdaptorTrampoline);

src/frames.h

@@ -709,7 +709,6 @@ class JavaScriptFrame : public StandardFrame {
   // actual passed arguments are available in an arguments adaptor
   // frame below it on the stack.
   inline bool has_adapted_arguments() const;
-  int GetArgumentsLength() const;
 
   // Garbage collection support.
   void Iterate(RootVisitor* v) const override;
@@ -899,8 +898,6 @@ class ArgumentsAdaptorFrame: public JavaScriptFrame {
   void Print(StringStream* accumulator, PrintMode mode,
              int index) const override;
 
-  static int GetLength(Address fp);
-
  protected:
   inline explicit ArgumentsAdaptorFrame(StackFrameIteratorBase* iterator);
 

src/runtime/runtime-scopes.cc

@@ -595,11 +595,14 @@ RUNTIME_FUNCTION(Runtime_NewSloppyArguments) {
   iterator.Advance();
   JavaScriptFrame* function_frame = JavaScriptFrame::cast(iterator.frame());
   DCHECK(function_frame->is_java_script());
-  int argc = function_frame->GetArgumentsLength();
+  int argc = function_frame->ComputeParametersCount();
   Address fp = function_frame->fp();
   if (function_frame->has_adapted_arguments()) {
     iterator.Advance();
-    fp = iterator.frame()->fp();
+    ArgumentsAdaptorFrame* adaptor_frame =
+        ArgumentsAdaptorFrame::cast(iterator.frame());
+    argc = adaptor_frame->ComputeParametersCount();
+    fp = adaptor_frame->fp();
   }
 
   Object** parameters = reinterpret_cast<Object**>(