Add asserts to ensure that we:

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
===================================================================
--- src/ia32/lithium-codegen-ia32.cc	(revision 9277)
+++ src/ia32/lithium-codegen-ia32.cc	(working copy)
@@ -70,6 +70,12 @@
   ASSERT(is_unused());
   status_ = GENERATING;
   CpuFeatures::Scope scope(SSE2);
+
+  // Open a frame scope to indicate that there is a frame on the stack.  The
+  // MANUAL indicates that the scope shouldn't actually generate code to set up
+  // the frame (that is done in GeneratePrologue).
+  FrameScope frame_scope(masm_, StackFrame::MANUAL);
+
   return GeneratePrologue() &&
       GenerateBody() &&
       GenerateDeferredCode() &&