javac: ending positions generation and DiagnosticListener

[Per Bothner]

On 12/07/2013 06:06 AM, Eugene Zhuravlev wrote:
> Could we hope to see these optimizations in JDK 8? Would it be also
> possible to backport them to JDK 7?

Technically it should be easy enough.

I've attached a proposed patch.  It compiles. It's been years
since I worked on javac, so I don't know how to run the tests.
-- 
	--Per Bothner
per.bothner at oracle.com   per at bothner.com   http://per.bothner.com/
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