[llvm-commits] Add clang-tools-extra to the Clang build bots

[David Blaikie]

This patch adds support for syncing (the building happens for free
thanks to Chandler's build system (make & cmake) work) up the
clang-tools-extra builds into the right place.

If it'd be preferable for these extra tools to only be built on some
builders I could see about doing something more involved (or at least
conditional, like the compiler_rt checkout option).

I've verified this on my local build master & it seems to be building
the right bits:

"llvm[5]: Linking Debug+Asserts executable remove-cstr-calls"
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