[llvm-commits] [CMake] Restructure how Clang, Polly and other external tools get included.

[Michael Spencer]

While making lld build under the tools directory I decided to refactor how this
works.

There is now a macro, add_llvm_external_tool, which takes the name of the
expected subdirectory. This sets up two CMake options.

  * LLVM_EXTERNAL_${NAME}_SOURCE_DIR
      This is the path to the source. It defaults to tools/${name}.
  * LLVM_EXTERNAL_${NAME}_BUILD
      Enable and disable building the tool as part of LLVM.

I chose LLVM_EXTERNAL_${NAME} as a prefix so they all show up together in the
GUI.

- Michael Spencer
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