* Enable shell highlighting on code block
* Shallow clone of source due to extensive history
* Line break and sort the CMake options for visibility
* Disable most extraneous options (e.g. docs, tests, benchmarks,
clang-tools-extra, OpenCL interface)
* Only build for the host architecture by default
* Support other sub-make interfaces, like the recommended Ninja Build
System
* Harden against paths with spaces
* Prefer linking against the newly built LLVM libraries by prepending to
LD_LIBRARY_PATH
