jit.util.ircalladdr - typo

jit.util.ircalladdr - Removed example, updated return to be always 0, made it clear in the description that it no longer works as it previously did.

jit.util.ircalladdr - Minor Change

jit.util.ircalladdr - Added a Note.

jit.util.ircalladdr - Fix LuaJIT typo

jit.util.ircalladdr - No change reason was given