[Core] add some function-level documentation to src/pic_jit.c. I can't document all these functions, however, because i do not know what they all do.
[Core] add some function-level documentation to src/pic_jit.c. I can't document all these functions, however, because i do not know what they all do.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@30550 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot