[MIPS] Initial checkin for MIPS changes for GOLD.

gold/target.h

Index: gold/target.h
===================================================================
--- a/gold/target.h
+++ b/gold/target.h
@@ -60,6 +60,7 @@
 class Output_section;
 class Input_objects;
 class Task;
+class Output_data_dynamic;
 
 // The abstract class for target specific handling.
 
@@ -203,6 +204,11 @@
 		    Symbol_table* symtab)
   { return this->do_finalize_sections(layout, input_objects, symtab); }
 
+  // Fix data that are known after finalize_sections for MIPS (and possible
+  // some other architectures).
+  void fix_sections(Layout* layout, Symbol_table* symtab)
+  { return this->do_fix_sections(layout, symtab); }
+
   // Return the value to use for a global symbol which needs a special
   // value in the dynamic symbol table.  This will only be called if
   // the backend first calls symbol->set_needs_dynsym_value().
@@ -235,6 +241,11 @@
   is_local_label_name(const char* name) const
   { return this->do_is_local_label_name(name); }
 
+  // Get the value for target specific dynamic tags.
+  unsigned int
+  dynamic_tag_value(elfcpp::DT tag) const
+  { return this->do_dynamic_tag_value(tag); }
+
   // Get the symbol index to use for a target specific reloc.
   unsigned int
   reloc_symbol_index(void* arg, unsigned int type) const
@@ -467,6 +478,11 @@
   { }
 
   // Virtual function which may be implemented by the child class.
+  virtual void
+  do_fix_sections(Layout*, Symbol_table*)
+  { }
+
+  // Virtual function which may be implemented by the child class.
   virtual uint64_t
   do_dynsym_value(const Symbol*) const
   { gold_unreachable(); }
@@ -495,6 +511,12 @@
   do_is_local_label_name(const char*) const;
 
   // Virtual function that must be overridden by a target which uses
+  // target specific dynamic tags.
+  virtual unsigned int
+  do_dynamic_tag_value(elfcpp::DT) const
+  { gold_unreachable(); }
+
+  // Virtual function that must be overridden by a target which uses
   // target specific relocations.
   virtual unsigned int
   do_reloc_symbol_index(void*, unsigned int) const