<rdar://problem/9624306> clean up darwin platform to use xcrun. Set up variables in darwin_bni.mk.  Use GetCNAVar in AppleBI.mk

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@133487 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed