Move private classes into anonymous namespaces

NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232944 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/LiveInterval.cpp

@@ -32,6 +32,7 @@
 #include <algorithm>
 using namespace llvm;
 
+namespace {
 //===----------------------------------------------------------------------===//
 // Implementation of various methods necessary for calculation of live ranges.
 // The implementation of the methods abstracts from the concrete type of the
@@ -293,6 +294,7 @@ private:
     return I;
   }
 };
+} // namespace
 
 //===----------------------------------------------------------------------===//
 //   LiveRange methods