Suggested backports of JDK 7 langtools fixes to OpenJDK 6

[Joe Darcy]

Hello.

In addition to the JDK 7 fix for

    6511613: javac unexpectedly doesn't fail in some cases if an 
annotation processor specified

which Jon has already backported to OpenJDK 6, in my estimation some 
other recent fixes to langtools in JDK 7 would be fine backports to 
OpenJDK 6 too:

    6927797: langtools/test/tools/javac/EarlyAssert.java fails when run 
with assertions enabled (-ea)
    6926703: apt tests should run with assertions enabled

I would gladly let someone else have the honor of doing the backport; 
otherwise, I'll prepare the backports myself as time permits.

-Joe