[9] RFR (S): 8058293: Bit set computation in MHs.findFirstDupOrDrop/findFirstDrop is broken

[Vladimir Ivanov]

https://bugs.openjdk.java.net/browse/JDK-8058293
http://cr.openjdk.java.net/~vlivanov/8058293/webrev.00

Bit set computation in MHs.findFirstDupOrDrop/findFirstDrop is incorrect 
due to widening primitive conversions (int -> long) taking place. The 
fix is to explicitly use long where needed.

Also, fixed a case when reorder represents a permutation (zeroPos == 
newArity).

Testing: jck (api/java_lang/invoke), jdk/java/lang/invoke, 
jdk/java/util/streams w/ "-ea -esa" and COMPILE_THRESHOLD={0,30}

Thanks!

Best regards,
Vladimir Ivanov