RFR: 8259074: regex benchmarks and tests [v2]

[Martin Buchholz]

> 8259074: regex benchmarks and tests

Martin Buchholz has updated the pull request incrementally with one additional commit since the last revision:

  address comments from @amalloy; introduce technically correct use of "numeral"

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1940/files
  - new: https://git.openjdk.java.net/jdk/pull/1940/files/cf0922f4..abb6c672

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1940&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1940&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1940.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1940/head:pull/1940

PR: https://git.openjdk.java.net/jdk/pull/1940