Re-implemented ecj support

[Andrew Haley]

Lillian Angel writes:
 > Be aware that the build is broken on x86_64 because of this bug in b22:
 > http://bugs.sun.com/view_bug.do?bug_id=6616627
 > 
 > It will be fixed when we upgrade to b23/b24.

How come we didn't notice this before now?

Andrew.

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