RFR: 8292446: Make TableRateStatistics optional in CHT [v5]

[Johan Sjölén]

> Right now the footprint of disabling statistics for tables where they're not used is minimal as they're single instance and static. We're working on using CHT in more contexts, where it will be dynamically allocated, and then these changes will add up to something more substantial.
> 
> Passes tier1+tier2

Johan Sjölén has updated the pull request incrementally with one additional commit since the last revision:

  Make statistics disabled by defalt

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9899/files
  - new: https://git.openjdk.org/jdk/pull/9899/files/8353bbc3..66aecbbb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9899&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9899&range=03-04

  Stats: 8 lines in 6 files changed: 0 ins; 1 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/9899.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9899/head:pull/9899

PR: https://git.openjdk.org/jdk/pull/9899