RFR: 8256535: C2: randomize CCP processing order for stress testing [v2]

[Roberto Castañeda Lozano]

> Add `StressCCP` option to randomize the selection of the node to be examined in each CCP iteration.

Roberto Castañeda Lozano has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Update copyright year
 - Merge branch 'master' into JDK-8256535
 - Merge branch 'master' into JDK-8256535
 - Add missing bug reference
 - 8256535: C2: randomize CCP processing order for stress testing
   
   Add 'StressCCP' option to randomize the selection of the node to be examined in
   each CCP iteration.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1765/files
  - new: https://git.openjdk.java.net/jdk/pull/1765/files/95d2cae3..ba182c7e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1765&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1765&range=00-01

  Stats: 48323 lines in 1564 files changed: 26858 ins; 9646 del; 11819 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1765.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1765/head:pull/1765

PR: https://git.openjdk.java.net/jdk/pull/1765