[Harmony Wiki] Update of "Jitrino OPT/light jni" by Mikhail Fursov

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The following page has been changed by Mikhail Fursov:
http://wiki.apache.org/harmony/Jitrino_OPT/light_jni

New page:
''' 'light_jni' ''' - allows to call some predefined JNI methods directly, without use of JNI stub.
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If a JNI method does not use Java environment it can be called directly without creation of JNI stub. 
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In this case NULL is passed as a parameter to a method instead of JNIEnv*.
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By default the optimization works only for hardcoded set of known methods.
To make it work for your method, use the following command line option:

{{{
-XX:jit.arg.codegen.light_jni.light_jni_methods=my/Method.foo1,my/Method.foo2
}}}