RFR: Codetools 7902833

[Eric Caspole]

New JMH for Math and StrictMath, the older ones in micros-jdk11 and the newer ones in micros-jdk15.

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Commit messages:
 - Remove blank lines
 - Add the j.l.Math versions
 - Add micros-jdk15 for testing new methods in StrictMath
 - First version, still needs work and later JDK version fixes
 - First version, still needs work and later JDK version fixes

Changes: https://git.openjdk.java.net/jmh-jdk-microbenchmarks/pull/6/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmh-jdk-microbenchmarks&pr=6&range=00
  Stats: 1659 lines in 11 files changed: 1646 ins; 9 del; 4 mod
  Patch: https://git.openjdk.java.net/jmh-jdk-microbenchmarks/pull/6.diff
  Fetch: git fetch https://git.openjdk.java.net/jmh-jdk-microbenchmarks pull/6/head:pull/6

PR: https://git.openjdk.java.net/jmh-jdk-microbenchmarks/pull/6