RFR: 8211002: test/jdk/java/lang/Math/PowTests.java skips testing for non-corner-case values [v2]

[Brian Burkhalter]

> Please consider this proposal to add some test coverage comparing `Math` and `StrictMath` results of `pow()`.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8211002: Change so that Tests.testUlpDiff() handles the NaNs and accepts a ulp tolerance of 2

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4758/files
  - new: https://git.openjdk.java.net/jdk/pull/4758/files/0cebcfc8..2fe3ff35

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4758&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4758&range=00-01

  Stats: 10 lines in 1 file changed: 0 ins; 6 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4758.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4758/head:pull/4758

PR: https://git.openjdk.java.net/jdk/pull/4758