Crash in 94e8432ae1b4fdddb1ba99dbbd5c8eaf740e6802

[berkinilbeyi]

RPython crash if using bitwise flag computation w/o virtualizables (issue #20). Likely RPython related:

% cd /work/bits0/bi45/misc/spec/cpu2006/benchspec/CPU2006/445.gobmk/run/run_base_test_arm-newlib-gcc43.0000
% pydgin-arm-jit gobmk_base.arm-newlib-gcc43 --quiet --mode gtp < dniwog.tst
XXX 3221209167
= white

RPython traceback:
  File "rpython_jit_metainterp_optimizeopt_unroll.c", line 12776, in UnrollOptimizer_jump_to_already_compiled_trace
  File "rpython_jit_metainterp_optimizeopt_unroll.c", line 24138, in UnrollOptimizer__inline_short_preamble
  File "rpython_jit_metainterp_optimizeopt_intbounds.c", line 124, in OptIntBounds_optimize_GUARD_TRUE
  File "rpython_jit_metainterp_optimizeopt_rewrite.c", line 2398, in OptRewrite_optimize_guard
  File "rpython_jit_metainterp_optimizeopt_pure.c", line 1324, in OptPure_optimize_default
  File "rpython_jit_metainterp_optimizeopt_optimizer.c", line 15330, in _emit_operation__rpython_jit_metainterp_optimize
  File "rpython_jit_metainterp_optimizeopt_optimizer.c", line 17065, in Optimizer_store_final_boxes_in_guard
Fatal RPython error: AssertionError
Aborted