After years of telling people: 'If you ever find any of my code that self-move-assigns, send me a bug report.' Somebody finally took me up on it.  vector::erase(begin(), begin()) does a self-move-assign of every element in the vector, leaving all of those elements in an unspecified state.  I checked the other containers for this same bug and did not find it.  Added test case.

llvm-svn: 179760
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Cr-Mirrored-Commit: ab65a6f560438af4eb60aa0d66a44c044debf37b
2 files changed