Patch: Remove exception catching from normal path in Arrays.equals.

[David Daney]

Greetings:

Currently all variants of java.util.Arrays.equals() catch 
NullPointerExceptions to detect null valued parameters.  In one of our 
programs this is a fairly common case and the throw/catch overhead was 
significant.

This patch replaces the exception catching logic with explicit checks 
for null values.


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