[8u] approval request for 8145550: Megamorphic invoke should use CompiledFunction variants without any LinkLogic, 8145669: apply2call optimized callsite fails after becoming megamorphic

[Sundararajan Athijegannathan]

Please approve the backport of the following fixes:

8145550: Megamorphic invoke should use CompiledFunction variants without 
any LinkLogic
https://bugs.openjdk.java.net/browse/JDK-8145550
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-December/005736.html

8145669: apply2call optimized callsite fails after becoming megamorphic
https://bugs.openjdk.java.net/browse/JDK-8145669
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-December/005747.html

jdk8u-dev combined webrev:
http://cr.openjdk.java.net/~sundar/8145550_8145669/8u/webrev.00/

Apart from the modular source layout changes, the tests have to be 
adjusted slightly for jdk8u -- as tests in jdk9 use a new Nashorn engine 
option that does not exist in jdk8u. For jdk8u, the tests use System 
property to configure megamorphic threshold  and @fork option. I'm 
CC'ing nashorn-dev for review.

Thanks,
-Sundar