Remove arguments shadow from scopes, stop rewriting parameters.

arguments/src/arm/full-codegen-arm.cc

Index: arguments/src/arm/full-codegen-arm.cc
diff --git a/arguments/src/arm/full-codegen-arm.cc b/arguments/src/arm/full-codegen-arm.cc
index 369a0b8d26ce1f3887f2824f427a08dc9aebe6f3..dae008213d41ba27170a350aa4460641c3403931 100644
--- a/arguments/src/arm/full-codegen-arm.cc
+++ b/arguments/src/arm/full-codegen-arm.cc
@@ -213,12 +213,6 @@ void FullCodeGenerator::Generate(CompilationInfo* info) {
     ArgumentsAccessStub stub(ArgumentsAccessStub::NEW_OBJECT);
     __ CallStub(&stub);
 
-    Variable* arguments_shadow = scope()->arguments_shadow();
-    if (arguments_shadow != NULL) {
-      // Duplicate the value; move-to-slot operation might clobber registers.
-      __ mov(r3, r0);
-      Move(arguments_shadow->AsSlot(), r3, r1, r2);
-    }
     Move(arguments->AsSlot(), r0, r1, r2);
   }