Use available resources to parallelize llvm build.
Use available resources to parallelize llvm build.

llvm is ammenable to parallel make (with -j flag). This sets -j to the number of cpus on the system. A user can specify something different by setting NPROCS.

r: bradcray, sungeun

git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@23401 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

CoryMcCartan/chapel,hildeth/chapel,chizarlicious/chapel,sungeunchoi/chapel,chizarlicious/chapel,sungeunchoi/chapel,sungeunchoi/chapel,hildeth/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,hildeth/chapel,chizarlicious/chapel,hildeth/chapel,hildeth/chapel,chizarlicious/chapel,chizarlicious/chapel,sungeunchoi/chapel,chizarlicious/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,chizarlicious/chapel,sungeunchoi/chapel,hildeth/chapel,sungeunchoi/chapel,hildeth/chapel,CoryMcCartan/chapel,sungeunchoi/chapel