RFR(M): 8136525 Generate interpreter entries only once and avoid unnecessary jump to jump

[Doerr, Martin]

Hi,

I improved the interpreter entries by avoiding multiple generation of the normal and native entries as well as entries which just jump to one of them.
Please note that I didn't test it on aarch64.

Please review this change.  I please need a sponsor.
http://cr.openjdk.java.net/~mdoerr/8136525_interp_entries/webrev.00/

Best regards,
  Martin