Third codegen test passing for simulated MIPS.

runtime/vm/code_patcher_mips.cc

Index: runtime/vm/code_patcher_mips.cc
===================================================================
--- runtime/vm/code_patcher_mips.cc	(revision 20729)
+++ runtime/vm/code_patcher_mips.cc	(working copy)
@@ -7,6 +7,7 @@
 
 #include "vm/code_patcher.h"
 
+#include "vm/instructions.h"
 #include "vm/object.h"
 
 namespace dart {
@@ -14,8 +15,8 @@
 uword CodePatcher::GetStaticCallTargetAt(uword return_address,
                                          const Code& code) {
   ASSERT(code.ContainsInstructionAt(return_address));
-  UNIMPLEMENTED();
-  return 0;
+  CallPattern call(return_address, code);
+  return call.TargetAddress();
 }
 
 
@@ -23,7 +24,8 @@
                                     const Code& code,
                                     uword new_target) {
   ASSERT(code.ContainsInstructionAt(return_address));
-  UNIMPLEMENTED();
+  CallPattern call(return_address, code);
+  call.SetTargetAddress(new_target);
 }