[proxies] Better print for proxies in d8

src/runtime/runtime-proxy.cc

Index: src/runtime/runtime-proxy.cc
diff --git a/src/runtime/runtime-proxy.cc b/src/runtime/runtime-proxy.cc
index 6980b88caef0309077e6c9eb6ae03ab4d42963db..3a521c6b7c49831e8cbcc6f0be1fd2c7b589f191 100644
--- a/src/runtime/runtime-proxy.cc
+++ b/src/runtime/runtime-proxy.cc
@@ -149,7 +149,7 @@ RUNTIME_FUNCTION(Runtime_IsJSProxy) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_GetHandler) {
+RUNTIME_FUNCTION(Runtime_JSProxyGetHandler) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(JSProxy, proxy, 0);
@@ -157,7 +157,15 @@ RUNTIME_FUNCTION(Runtime_GetHandler) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_RevokeProxy) {
+RUNTIME_FUNCTION(Runtime_JSProxyGetTarget) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSProxy, proxy, 0);
+  return proxy->target();
+}
+
+
+RUNTIME_FUNCTION(Runtime_JSProxyRevoke) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSProxy, proxy, 0);