RFR(M): 8039407 : Regression test needed for JDK-8015396

[David Chase]

Bug 8015396 needs a regression test; I cannot reproduce it so there is no "fix" to check in,
hence the separate bug to cover adding the test.  The test was included with the bug report,
and has been adapted here to jtreg.

webrev: http://cr.openjdk.java.net/~drchase/8039407/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8039407

testing: I artificially stuffed a "NaN" into the result value and observed that the test would then
report a failure.

David

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