Edit jitted code error message about unresolved globals for consistency with interpreter

kernel/modelverse_jit/jit.py

@@ -622,7 +622,7 @@ class AnalysisState(object):
         #         global_var, = yield [("RD", [_globals, var_name])]
         #
         #         if global_var is None:
-        #             raise Exception("Runtime error: global '%s' not found" % (var_name))
+        #             raise Exception("Not found as global: %s" % (var_name))
         #
         #         tmp = global_var
 
@@ -650,7 +650,7 @@ class AnalysisState(object):
                 tree_ir.CallInstruction(
                     tree_ir.LoadGlobalInstruction('Exception'),
                     [tree_ir.LiteralInstruction(
-                        "Runtime error: global '%s' not found" % var_name)
+                        "Not found as global: %s" % var_name)
                     ])),
             tree_ir.EmptyInstruction())