[PATCH] [sanitizer] Extend sancov.py to show which PCs are missing from coverage.

[Sergey Matveev]

In http://reviews.llvm.org/D9228#165634, @kcc wrote:

> looks good, but I wonder if a test can be added?


That would make python a requirement for running the test suite, not sure if good idea.


http://reviews.llvm.org/D9228

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