RFR: JDK-8033464 and JDK-8033931 - Linux code cleanup

[Gerald Thornbrugh]

Hi,

I am a member of the Oracle Hotspot group and there is an initiative to 
clean up
things like uninitialized variables and unclosed file descriptors in 
JDK8. This is a
backport of fixes that have already been putback into JDK9. I have run 
UTE and
JPRT tests on Linux machines without problems. The below webrev show the 
fixes for
the Linux area.

Bugs:

JDK-8033464 is not visible because it has been marked as Oracle 
confidential.

JDK-8033464 describes a JDK8 Linux specific code cleanup to address
possible uninitialized variables and unclosed file descriptors. These 
issues
were addressed in the fix.

https://bugs.openjdk.java.net/browse/JDK-8033464

JDK-8033931 is a JDK9 issue with an assert that was putback as part of the
fix for JDK-8033464.  It will also be addressed with this putback.

https://bugs.openjdk.java.net/browse/JDK-8033931

Webrev:

http://cr.openjdk.java.net/~dcubed/for_gthornbr/8033464-webrev/1-jdk8u-hs-dev/ 



Please review my changes and let me know if you have questions.

Thanks,

Gerald Thornbrugh