Move some helpers from the global namespace into anonymous ones.

llvm-svn: 344468
diff --git a/llvm/lib/Transforms/Instrumentation/ControlHeightReduction.cpp b/llvm/lib/Transforms/Instrumentation/ControlHeightReduction.cpp
index 2c0721f..8f4159d 100644
--- a/llvm/lib/Transforms/Instrumentation/ControlHeightReduction.cpp
+++ b/llvm/lib/Transforms/Instrumentation/ControlHeightReduction.cpp
@@ -621,9 +621,10 @@
 // CHRBiasThreshold, put Key into TrueSet and return true. If FalseProb >=
 // CHRBiasThreshold, put Key into FalseSet and return true. Otherwise, return
 // false.
-template<typename K, typename S, typename M>
-bool checkBias(K *Key, BranchProbability TrueProb, BranchProbability FalseProb,
-               S &TrueSet, S &FalseSet, M &BiasMap) {
+template <typename K, typename S, typename M>
+static bool checkBias(K *Key, BranchProbability TrueProb,
+                      BranchProbability FalseProb, S &TrueSet, S &FalseSet,
+                      M &BiasMap) {
   BranchProbability Threshold = getCHRBiasThreshold();
   if (TrueProb >= Threshold) {
     TrueSet.insert(Key);