EXCLUDE_FROM_ALL property.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@156090 91177308-0d34-0410-b5e6-96231b3b80d8

This was never being compiled at all and was bitrotting
as a result.

Also compile SampleAnalyzerPlugin as a module, not a library,
and fix a mistake with not passing the source files
to add_clang_library().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150378 91177308-0d34-0410-b5e6-96231b3b80d8

by default, rather than whether they may be built at all.

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This patch simplifies writing of standalone Clang tools. As an
example, we add clang-check, a tool that runs a syntax only frontend
action over a .cc file. When you integrate this into your favorite
editor, you get much faster feedback on your compilation errors, thus
reducing your feedback cycle especially when writing new code.

The tool depends on integration of an outstanding patch to CMake to
work which allows you to always have a current compile command
database in your cmake output directory when you set
CMAKE_EXPORT_COMPILE_COMMANDS.

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