[rfc][gold plugin] Fix pr19901

Wed Jul 30 15:31:36 PDT 2014

And this is a version that I think is ready for a real code review.

The only difference is a bug fix for linkonce_odr hiding (test added
in r214311) and refactoring. There were less opportunities for code
sharing with LTO then I was expecting. In fact,  factoring out
runLTOPasses looks a bit silly. Let me know if you would prefer to
just split the two libraries completely.

Cheers,
Rafael
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