[8u40] Request for approval: 8058293, 8058291

[Vladimir Ivanov]

Please, approve backport of the following changes into 8u40:

   (1) 8058293: Bit set computation in 
MHs.findFirstDupOrDrop/findFirstDrop is broken
       https://bugs.openjdk.java.net/browse/JDK-8058293
       http://hg.openjdk.java.net/jdk9/dev/jdk/rev/50d878aa3d5c

   (2) 8058291: Missing some checks during parameter validation
       https://bugs.openjdk.java.net/browse/JDK-8058291
       http://hg.openjdk.java.net/jdk9/dev/jdk/rev/6fac21b58f2b

   (3) 8058584: Ignore java/lang/invoke/LFCaching/LFGarbageCollectedTest 
until 8057020 is fixed
       https://bugs.openjdk.java.net/browse/JDK-8058584
       http://hg.openjdk.java.net/jdk9/dev/jdk/rev/75a95840a125

The changes apply cleanly.

Thanks!

Best regards,
Vladimir Ivanov