Add asserts to ensure that we:

src/deoptimizer.cc

Index: src/deoptimizer.cc
===================================================================
--- src/deoptimizer.cc	(revision 9277)
+++ src/deoptimizer.cc	(working copy)
@@ -71,6 +71,8 @@
 #endif
 
 
+// We rely on this function not causing a GC.  It is called from generated code
+// without having a real stack frame in place.
 Deoptimizer* Deoptimizer::New(JSFunction* function,
                               BailoutType type,
                               unsigned bailout_id,
@@ -462,6 +464,8 @@
 }
 
 
+// We rely on this function not causing a GC.  It is called from generated code
+// without having a real stack frame in place.
 void Deoptimizer::DoComputeOutputFrames() {
   if (bailout_type_ == OSR) {
     DoComputeOsrOutputFrame();