RFR: 8293287 add ReplayReduce flag [v3]

[Dean Long]

> Add an experimental flag to help developers "reduce" a replay file.
> 
> As a first step, I plan to simulate reduced inlining. This will output multiple "compile" lines as if the first level of inlining never happened:
> A --> B --> C
> A --> D --> E
> becomes
> B --> C
> D --> E
> Developers can repeat iteratively until the replay crash no longer reproduces.

Dean Long has updated the pull request incrementally with one additional commit since the last revision:

  remove support for pre-2013 replay files

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/10134/files
  - new: https://git.openjdk.org/jdk/pull/10134/files/73d6e812..4ba53b45

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10134&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10134&range=01-02

  Stats: 88 lines in 2 files changed: 0 ins; 87 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10134.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10134/head:pull/10134

PR: https://git.openjdk.org/jdk/pull/10134