RFR 8054715: Changing the source roots and/or their filters forces a full recompile.

[Fredrik Öhrström]

Changing the source roots and/or their filters forces a full recompile,
since the source roots and the filters are included in the command line
memory in the javac_state file.

This is a bug, since all changes to the set of source files should be
gracefully handled incrementally.

SJavac should do an incremental compile both when:
beta/B.java is deleted from the file system (this works)
or when
"-x beta" is added to the command line to exclude beta/B.java from
compilation (this does not work).

Simple fix, do not include the filters and the source roots in the memory
line in the javac_state file.

http://cr.openjdk.java.net/~ohrstrom/webrev-8054715-sources/

https://bugs.openjdk.java.net/browse/JDK-8054715

//Fredrik
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