Initial cut at integrating compiler-rt (on Darwin) w/ clang build.
 - compiler-rt should be checked out into $LLVM_SRC_ROOT/projects/compiler-rt.

 - On Darwin, this will automatically build the runtime libraries clang needs
   into $OBJROOT/lib/clang/<version>/darwin/...

 - The mechanism can easily support other platforms, and can eventually support
   multiple platforms once clang has some kind of configure process (for
   specifying the desired targets).

 - Feedback on the approach is welcome.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@93910 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Makefile b/lib/Makefile
index adf9474..d499ee5 100755
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -8,8 +8,8 @@
 ##===----------------------------------------------------------------------===##
 LEVEL = ../../..
 
-PARALLEL_DIRS = Headers Basic Lex Parse AST Sema CodeGen Analysis Rewrite \
-	Frontend Index Driver
+PARALLEL_DIRS = Headers Runtime Basic Lex Parse AST Sema CodeGen Analysis \
+                Rewrite Frontend Index Driver
 
 include $(LEVEL)/Makefile.common