RFR: JDK-8239544 : Javac does not respect should-stop.ifNoError policy to stop after CompileState PARSE, ENTER and PROCESS

[Adam Sotona]

Hi,
I would like to ask you for review of the JavaCompiler patch fixing its response to should-stop.ifNoError= option for PARSE, ENTER and PROCESS compiler states.
The patch also includes new T8239544.java matrix regression test validating the compiler really stops at the requested states even under various compiler policies.
The most critical part of the fix was to do not affect existing (golden-file) tests expecting exact compiler errors and also do not affect MultiTaskListener expected behavior (and related tests).

JBS: https://bugs.openjdk.java.net/browse/JDK-8239544 <https://bugs.openjdk.java.net/browse/JDK-8239544>
webrev: http://cr.openjdk.java.net/~asotona/8239544/webrev.00/ <http://cr.openjdk.java.net/~asotona/8239544/webrev.00/>

Mach5 build passed Tier1, Tier2 and Tier3 tests

Thank you,
Adam

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