[8u] approval request for 8148926: Call site profiling fails on braces-wrapped anonymous function

[Sundararajan Athijegannathan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8148926
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2016-February/005923.html
jdk8u backport webrev: http://cr.openjdk.java.net/~sundar/8148926/8u/

Backported 'as is' except for the modular layout difference.

Thanks
-Sundar