reset method for WinCOFFObjectWriter

[Owen Anderson]

> On Sep 15, 2014, at 1:23 PM, Yaron Keren <yaron.keren at gmail.com> wrote:
> 
> I don't know if there are other users of PassManager that keep it alive, so doFinalization() and reset() sufferred code rot with regard to reseting state. Most are OK but pieces are missing here and threre. Keeping this existing structure alive will enable reusing the passManager.

We make use of this exact functionality, and test it internally for the use cases we care about.  Unfortunately, that does not include COFF support.

—Owen
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