Make all of the tools build in parallel. Missing this caused incremental
rebuilds to serially link each tool, which is really really slow.

We still have to build libclang serially first because c-index-test
depends on it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161612 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed