Internals: Use C++14 quoted literal std::string

src/V3Scope.cpp

@@ -303,7 +303,7 @@ class ScopeVisitor final : public VNVisitor {
     }
     void visit(AstScopeName* nodep) override {
         // If there's a %m in the display text, we add a special node that will contain the name()
-        const string prefix = std::string{"__DOT__"} + m_scopep->name();
+        const string prefix = "__DOT__"s + m_scopep->name();
         // TOP and above will be the user's name().
         // Note 'TOP.' is stripped by scopePrettyName
         // To keep correct visual order, must add before other Text's