[Interpreter] Add support for parameter variables.

src/ia32/builtins-ia32.cc

Index: src/ia32/builtins-ia32.cc
diff --git a/src/ia32/builtins-ia32.cc b/src/ia32/builtins-ia32.cc
index 392ed430e8a8a3ef5a65510fb96789cc7c530fcf..5f663b0c65819fdac86e736656ce541e3bcc9d5e 100644
--- a/src/ia32/builtins-ia32.cc
+++ b/src/ia32/builtins-ia32.cc
@@ -752,9 +752,14 @@ void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
 
   // Leave the frame (also dropping the register file).
   __ leave();
-  // Return droping receiver + arguments.
-  // TODO(rmcilroy): Get number of arguments from BytecodeArray.
-  __ Ret(1 * kPointerSize, ecx);
+
+  // Drop receiver + arguments and return.
+  __ mov(ebx, FieldOperand(kInterpreterBytecodeArrayRegister,
+                           BytecodeArray::kParameterSizeOffset));
+  __ pop(ecx);
+  __ add(esp, ebx);
+  __ push(ecx);
+  __ ret(0);
 }