[MIPS] Initial checkin for MIPS changes for GOLD.

gold/output.cc

Index: gold/output.cc
===================================================================
--- a/gold/output.cc
+++ b/gold/output.cc
@@ -1723,6 +1723,10 @@
       val = pool->get_offset(this->u_.str);
       break;
 
+    case DYNAMIC_TARGET:
+      val = parameters->target().dynamic_tag_value(this->tag_);
+      break;
+
     default:
       val = this->u_.od->address() + this->offset_;
       break;