--- a/hotspot/src/share/vm/opto/reg_split.cpp	Tue Oct 21 11:23:52 2008 -0700
+++ b/hotspot/src/share/vm/opto/reg_split.cpp	Tue Oct 28 09:31:30 2008 -0700
@@ -53,6 +53,7 @@
   // Bail rather than abort
   int ireg = def->ideal_reg();
   if( ireg == 0 || ireg == Op_RegFlags ) {
+    assert(false, "attempted to spill a non-spillable item");
     C->record_method_not_compilable("attempted to spill a non-spillable item");
     return NULL;
   }