Added test for ifunc support in dynamic linker.

ifuncs now work in i386 and x86_64 when called in the same library as
well as in a different library.

Bug:6657325
Change-Id: Ic0c48b1b0a76cb90f36c20c79f68294cc3fd44a1

linker/linker.h

@@ -204,8 +204,12 @@ struct soinfo {
 
   void set_st_dev(dev_t st_dev);
   void set_st_ino(ino_t st_ino);
+  void set_has_ifuncs(bool ifunc);
   ino_t get_st_ino();
   dev_t get_st_dev();
+  bool get_has_ifuncs();
+
+
 
   soinfo_list_t& get_children();
 
@@ -218,6 +222,8 @@ struct soinfo {
   // when FLAG_NEW_SOINFO is set in this->flags.
   unsigned int version;
 
+  bool has_ifuncs;
+
   dev_t st_dev;
   ino_t st_ino;