RFR: 8355798: Implement JEP 514: Ahead-of-Time Command Line Ergonomics [v10]

[Ioi Lam]

> This is the implementation of the draft [JEP: Ahead-of-time Command Line Ergonomics](https://bugs.openjdk.org/browse/JDK-8350022)
> 
> - Implemented new flag `AOTCacheOutput`, which can be used to create an AOT cache using the "one-command workflow"
> - Added processing of the `JDK_AOT_VM_OPTIONS` environment variable that can supply extra VM options when creating an AOT cache
> - Added `%p` substitution for `AOTCache`, `AOTCacheOutput`, and `AOTConfiguration` options
> 
> Please see the [JEP](https://bugs.openjdk.org/browse/JDK-8350022) and [CSR](https://bugs.openjdk.org/browse/JDK-8356010) for detailed specification.
> 
> Examples:
> 
> 
> # Create an AOT cache with a single command:
> $ java -cp HelloWorld.jar -XX:AOTMode=record -XX:AOTCacheOutput=foo.aot HelloWorld
> Hello World
> Temporary AOTConfiguration recorded: foo.aot.config
> Launching child process /usr/bin/java to assemble AOT cache foo.aot using configuration foo.aot.config
> [...]
> Reading AOTConfiguration foo.aot.config and writing AOTCache foo.aot
> AOTCache creation is complete: foo.aot 10240000 bytes
> 
> # Create logging file for the AOT cache assembly phase
> $ export AOT_TOOL_COMMAND=-Xlog:cds:file=log.txt
> $ java -cp HelloWorld.jar -XX:AOTMode=record -XX:AOTCacheOutput=foo.aot HelloWorld
> 
> 
> Note: the child process is launched with Java API because the HotSpot native APIs are not sufficient (no way to set env vars for child process).

Ioi Lam has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 24 commits:

 - @erikj79 comments
 - Merge branch 'master' into 8355798-implement-leyden-ergo-jep-8350022
 - @vnkozlov comments
 - added info about JTREG/AOT_JDK testing
 - fixed whitespace
 - Merge branch 'master' into 8355798-implement-leyden-ergo-jep-8350022
 - java.md updates from @rose00
 - Resolved differences with CSR JDK-8356010
 - Added param to makefile function SetupAOT for choosing onestep vs twostep
 - Allow one-step training even when -XX:AOTMode=auto is specified
 - ... and 14 more: https://git.openjdk.org/jdk/compare/890456f0...0956fcad

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

Changes: https://git.openjdk.org/jdk/pull/24942/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24942&range=09
  Stats: 2088 lines in 24 files changed: 1564 ins; 459 del; 65 mod
  Patch: https://git.openjdk.org/jdk/pull/24942.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24942/head:pull/24942

PR: https://git.openjdk.org/jdk/pull/24942