Native wrapper optimization

[changren]

Hi, all
Attached patch(diff with hsx20) is supposed to speed up native
invocation. It rearranges the compiled-to-native wrapper code to
straighten branches which improves spatial locality. Micro
benchmark(500m consecutive JNI invocations with warm up) shows the
stalled CPU cycles caused by instruction fetch due to L1 ICache miss
decrease 3.4% on Intel Nehalem microarchitecture and 9.6% on Core
microarchitecture. The real execution time of the micro benchmark is
also decreased 5-10% respectively which reflects the improvement.
Thanks,
Joseph


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