Move helpers into anonymous namespaces. NFC.

llvm-svn: 277916
diff --git a/llvm/lib/CodeGen/LiveRegMatrix.cpp b/llvm/lib/CodeGen/LiveRegMatrix.cpp
index 7ee87c1..088a92d 100644
--- a/llvm/lib/CodeGen/LiveRegMatrix.cpp
+++ b/llvm/lib/CodeGen/LiveRegMatrix.cpp
@@ -70,9 +70,10 @@
   }
 }
 
-template<typename Callable>
-bool foreachUnit(const TargetRegisterInfo *TRI, LiveInterval &VRegInterval,
-                 unsigned PhysReg, Callable Func) {
+template <typename Callable>
+static bool foreachUnit(const TargetRegisterInfo *TRI,
+                        LiveInterval &VRegInterval, unsigned PhysReg,
+                        Callable Func) {
   if (VRegInterval.hasSubRanges()) {
     for (MCRegUnitMaskIterator Units(PhysReg, TRI); Units.isValid(); ++Units) {
       unsigned Unit = (*Units).first;