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

[Sergey Matveev]

In http://reviews.llvm.org/D9228#167162, @kcc wrote:

> LGTM, thanks!
>
> Once committed, please also update the docs at http://clang.llvm.org/docs/SanitizerCoverage.html#how-good-is-the-coverage


Committed r236641


http://reviews.llvm.org/D9228

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