8383882: javac: incremental compilation using --module misses classes

[JornVernee]

Draft:

• Recompile every source file in a module when any of the sources in the module was updated
• Any other module passed to --module that depends on a recompiled module is also recompiled.
• Future work: Elide compilation of dependent modules if the API of a recompiled module didn't change.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8383882: javac: incremental compilation using --module misses classes (Bug - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/31044/head:pull/31044
$ git checkout pull/31044

Update a local copy of the PR:
$ git checkout pull/31044
$ git pull https://git.openjdk.org/jdk.git pull/31044/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 31044

View PR using the GUI difftool:
$ git pr show -t 31044

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/31044.diff

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