RFR: 8297455: Use the official ToolProvider API to call javac [v2]

[Magnus Ihse Bursie]

> In JDK-8297041, the javacserver was moved out of the JDK itself, and lifted out as a separate buildtool. Due to this, internal classes in jdk.compiler were no longer available. Therefore, the closest way to calling javac as before were to use `com.sun.tools.javac.Main.compile()`. This method is however deprecated for removal, and relying on that was only needed as a temporary measure during the transition.
> 
> After the major refactoring of the javacserver tool in JDK-8297444, it will be easy to replace the Main.compile API with the official ToolProvider API instead.

Magnus Ihse Bursie 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.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11299/files
  - new: https://git.openjdk.org/jdk/pull/11299/files/1ab659c0..1ab659c0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11299&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11299&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11299.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11299/head:pull/11299

PR: https://git.openjdk.org/jdk/pull/11299