[modules][Patch][BugzillaID#20399] Do not assert when adding an implicit member coming from a module at writing time.

[Vassil Vassilev]

Hi,
   I am attaching a patch addressing bug report 
http://llvm.org/bugs/show_bug.cgi?id=20399
   I believe this bug could be reproduced also by a chaining PCHs but I 
haven't had the time to do it.
Vassil
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