[Allocator] Hoist the external helper function into a namespace scope

declaration. GCC 4.7 appears to get hopelessly confused by declaring
this function within a member function of a class template. Go figure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206152 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/Allocator.cpp

@@ -21,6 +21,8 @@
 
 namespace llvm {
 
+namespace detail {
+
 void printBumpPtrAllocatorStats(unsigned NumSlabs, size_t BytesAllocated,
                                 size_t TotalMemory) {
   errs() << "\nNumber of memory regions: " << NumSlabs << '\n'
@@ -30,6 +32,8 @@ void printBumpPtrAllocatorStats(unsigned NumSlabs, size_t BytesAllocated,
          << " (includes alignment, etc)\n";
 }
 
+} // End namespace detail.
+
 void PrintRecyclerStats(size_t Size,
                         size_t Align,
                         size_t FreeListSize) {