src: dumb down code by removing std::move

This would require C++11 features that would
otherwise not be available on clang + OS X on Node 6.x.

PR-URL: #18324
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>

src/node_url.cc

@@ -100,14 +100,16 @@ class URLHost {
   // internals too much.
   // These helpers are the easiest solution but we might want to consider
   // just not forcing strings into an union.
-  inline void SetOpaque(std::string&& string) {
+  inline void SetOpaque(std::string* string) {
     type_ = HostType::H_OPAQUE;
-    new(&value_.opaque) std::string(std::move(string));
+    new(&value_.opaque) std::string();
+    value_.opaque.swap(*string);
   }
 
-  inline void SetDomain(std::string&& string) {
+  inline void SetDomain(std::string* string) {
     type_ = HostType::H_DOMAIN;
-    new(&value_.domain) std::string(std::move(string));
+    new(&value_.domain) std::string();
+    value_.domain.swap(*string);
   }
 };
 
@@ -865,7 +867,7 @@ void URLHost::ParseOpaqueHost(const char* input, size_t length) {
     }
   }
 
-  SetOpaque(std::move(output));
+  SetOpaque(&output);
 }
 
 void URLHost::ParseHost(const char* input,
@@ -913,7 +915,7 @@ void URLHost::ParseHost(const char* input,
     return;
 
   // It's not an IPv4 or IPv6 address, it must be a domain
-  SetDomain(std::move(decoded));
+  SetDomain(&decoded);
 }
 
 // Locates the longest sequence of 0 segments in an IPv6 address