Convert DIRS to PARALLEL_DIRS.  They can be built independently.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3972 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/Makefile b/lib/CodeGen/Makefile
index 57ee916..c235800 100644
--- a/lib/CodeGen/Makefile
+++ b/lib/CodeGen/Makefile
@@ -1,4 +1,4 @@
 LEVEL = ../..
-DIRS  = PreOpts InstrSelection InstrSched RegAlloc PostOpts Mapping
+PARALLEL_DIRS  = PreOpts InstrSelection InstrSched RegAlloc PostOpts Mapping
 
 include $(LEVEL)/Makefile.common