Checkout the compatible release/12.x branch of llvm (#144)
Checkout the compatible release/12.x branch of llvm (#144)

Change-Id: I22d0d14c7e604d1deb33c82841eb4031a7d0c7f7
bright-tools/ccsm,bright-tools/ccsm,bright-tools/ccsm,bright-tools/ccsm