Provide a mechanism for naming a hash table so that it can be used in DumpStats to identify the tab…

runtime/vm/precompiler.cc

Index: runtime/vm/precompiler.cc
diff --git a/runtime/vm/precompiler.cc b/runtime/vm/precompiler.cc
index 556bc486ce3997fd5b4021c4ccc39d70cfd2f974..8f1e36771709d21d0bf5e5cf3916e723ddcd11b6 100644
--- a/runtime/vm/precompiler.cc
+++ b/runtime/vm/precompiler.cc
@@ -1057,6 +1057,8 @@ void Precompiler::CheckForNewDynamicFunctions() {
 
 class NameFunctionsTraits {
  public:
+  static const char* Name() { return "NameFunctionsTraits"; }
+
   static bool IsMatch(const Object& a, const Object& b) {
     return a.IsString() && b.IsString() &&
         String::Cast(a).Equals(String::Cast(b));