Build rL:346148 - C:346146 - #42 - green-dragon-22

Parameters
 LLVM_REV
Find a passing rev from the Clang Stage RA builder on the front page and enter that revision here.
 NODE
Which node should this job run on.  Typically we always start our upgrade cycle using Green-dragon-22 (the why is a longer story).
 CLEAN
Wipe the build directory?