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[sanitizer-coverage] add yet another flavour of coverage instrumentation: trace-pc-guard. The intent is to eventually replace all of {bool coverage, 8bit-counters, trace-pc} with just this one. Clang part

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[sanitizer-coverage] add two more modes of instrumentation: trace-div and trace-gep, mostly usaful for value-profile-based fuzzing; clang part

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The reason is that this (a) seems to work just fine and (b) useful when building stuff with
sanitizer+coverage, but need to exclude the sanitizer for a particular source file.

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[sanitizer-coverage] allow -fsanitize-coverage=trace-pc w/o any other sanitizer and w/o ...=[func,bb,edge]. This makes this syntax a superset of the GCC's syntax

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[sanitizer-coverage] implement -fsanitize-coverage=trace-pc. This is similar to trace-bb, but has a different API. We already use the equivalent flag in GCC for Linux kernel fuzzing. We may be able to use this flag with AFL too

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Documentation change for: http://reviews.llvm.org/D17169

Differential Revision: http://reviews.llvm.org/D17175

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Differential Revision: http://reviews.llvm.org/D16432

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Moved from https://code.google.com/p/address-sanitizer/wiki/AsanCoverage

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