[Interpreter] Add support for parameter variables.

src/arm/builtins-arm.cc

Index: src/arm/builtins-arm.cc
diff --git a/src/arm/builtins-arm.cc b/src/arm/builtins-arm.cc
index 8d95694038ed57605741674b15b5eff43f7ed737..5ebfe192f8ace959ab37e48b3fb2e5be83fad515 100644
--- a/src/arm/builtins-arm.cc
+++ b/src/arm/builtins-arm.cc
@@ -1003,8 +1003,11 @@ void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
 
   // Leave the frame (also dropping the register file).
   __ LeaveFrame(StackFrame::JAVA_SCRIPT);
-  // Drop receiver + arguments.
-  __ Drop(1);  // TODO(rmcilroy): Get number of arguments from BytecodeArray.
+
+  // Drop receiver + arguments and return.
+  __ ldr(ip, FieldMemOperand(kInterpreterBytecodeArrayRegister,
+                             BytecodeArray::kParameterSizeOffset));
+  __ add(sp, sp, ip, LeaveCC);
   __ Jump(lr);
 }