[8u backport] RFR(XS): 8051803 [parfait] warnings from b114 for hotspot.src.share.vm

[David Chase]

Summary: it’s a parfait warning, where convoluted and perhaps delicate logic ensures that a NULL could “never” appear.
Fix is to insert a null check and return the “nothing here” result (false) which (a) should never occur anyhow and
(b) is safe and consistent behavior.

webrev: http://cr.openjdk.java.net/~drchase/8051803/webrev.00/

bug: https://bugs.openjdk.java.net/browse/JDK-8051803

backport of: https://bugs.openjdk.java.net/browse/JDK-8028037

old review discussion: http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2014-March/013684.html

testing: local jtreg

David

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