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

llvm-svn: 36146
diff --git a/llvm/lib/Transforms/Utils/LowerSelect.cpp b/llvm/lib/Transforms/Utils/LowerSelect.cpp
index 27e1866..120c3b1 100644
--- a/llvm/lib/Transforms/Utils/LowerSelect.cpp
+++ b/llvm/lib/Transforms/Utils/LowerSelect.cpp
@@ -37,7 +37,7 @@
 
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       // This certainly destroys the CFG.
-      // This is a cluster of orthogonal Transforms:	
+      // This is a cluster of orthogonal Transforms:
       AU.addPreserved<UnifyFunctionExitNodes>();
       AU.addPreservedID(PromoteMemoryToRegisterID);
       AU.addPreservedID(LowerSwitchID);