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Point out that --coverage and -ftest-coverage, which is what most people
are used to, do not enable clang's frontend based coverage pass.

Suggested by Benn Bolay!

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Flesh out the section on interpreting coverage reports, mention the
coverage export feature, and add notes on how to build llvm with
coverage turned on.

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A number of warnings still remain, but these were the last of the
"unlexable code"-related ones (AFAICT).

I changed a few examples in docs/UsersManual.rst to showcase
-Wextra-tokens because it's already documented (-Wmultichar isn't), and
the sphinx C lexer apparently can't handle char literals like 'ab'. It
seemed like a better overall approach than just marking the code blocks
as none or console.


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Mention that the code coverage tool becomes less precise whenever
unpredictable changes in control flow occur.

Thanks to Sean Silva for pointing this out!

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Differential Revision: http://reviews.llvm.org/D20715

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