RFR [11] 8207838: AArch64: Float registers incorrectly resture in JNI call

[Andrew Haley]

I rewrote the test case.  It runs much faster. It detects exceptions
thrown by any thread. The previous test simply summed the arguments,
which does not detect arguments passed in the wrong order, so I
replaced the summation with a nonlinear combining function.

New version at http://cr.openjdk.java.net/~aph/8207838-1/

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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