Removed tabs everywhere except autogenerated & external files. Add make
target for tabs checking.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36146 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile.rules b/Makefile.rules
index 723fefc..56373c0 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -1726,8 +1726,10 @@
 endif
 
 check-line-length:
-	@egrep '.{81}' $(Sources)
+	@egrep -n '.{81}' $(Sources)
 
+check-for-tabs:
+	@egrep -n '	' $(Sources)
 #------------------------------------------------------------------------
 # Print out the directories used for building
 #------------------------------------------------------------------------