Give helper classes/functions local linkage. NFC.

llvm-svn: 351016
diff --git a/llvm/lib/Transforms/Scalar/LICM.cpp b/llvm/lib/Transforms/Scalar/LICM.cpp
index 44ef6ea..d204654 100644
--- a/llvm/lib/Transforms/Scalar/LICM.cpp
+++ b/llvm/lib/Transforms/Scalar/LICM.cpp
@@ -480,6 +480,7 @@
   return Changed;
 }
 
+namespace {
 // This is a helper class for hoistRegion to make it able to hoist control flow
 // in order to be able to hoist phis. The way this works is that we initially
 // start hoisting to the loop preheader, and when we see a loop invariant branch
@@ -706,6 +707,7 @@
     return HoistDestinationMap[BB];
   }
 };
+} // namespace
 
 /// Walk the specified region of the CFG (defined by all blocks dominated by
 /// the specified block, and that are in the current loop) in depth first