[9] RFR (M): 8050884: Intrinsify ValueConversions.identity() functions

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8050884/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8050884

Replace ValueConversions.identity() functions with intrinsics.

Testing: jdk/java/lang/invoke, jdk/java/util/streams, nashorn, octane w/ 
"-ea -esa" and COMPILE_THRESHOLD={0,30}.

Reviewed-by: vlivanov, ?
Contributed-by: john.r.rose at oracle.com

Thanks!

Best regards,
Vladimir Ivanov