[PATCH] Move asan-coverage into a separate phase.

[Kostya Serebryany]

Hi samsonov, nlewycky,

This change moves asan-coverage instrumentation
into a separate Module pass.
The other part of the change in clang introduces a new flag
-fsanitize-coverage=N.
Another small patch will update tests in compiler-rt.

With this patch no functionality change is expected except for the flag name.
The following changes will make the coverage instrumentation work with tsan/msan

http://reviews.llvm.org/D6152

Files:
  include/llvm/InitializePasses.h
  include/llvm/Transforms/Instrumentation.h
  lib/Transforms/Instrumentation/AddressSanitizer.cpp
  lib/Transforms/Instrumentation/CMakeLists.txt
  lib/Transforms/Instrumentation/Instrumentation.cpp
  lib/Transforms/Instrumentation/SanitizerCoverage.cpp
  test/Instrumentation/AddressSanitizer/coverage-dbg.ll
  test/Instrumentation/AddressSanitizer/coverage.ll
  test/Instrumentation/AddressSanitizer/coverage2-dbg.ll
  test/Instrumentation/SanitizerCoverage/
  test/Instrumentation/SanitizerCoverage/coverage-dbg.ll
  test/Instrumentation/SanitizerCoverage/coverage.ll
  test/Instrumentation/SanitizerCoverage/coverage2-dbg.ll
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