Third codegen test passing for simulated MIPS.

runtime/vm/instructions_mips.cc

Index: runtime/vm/instructions_mips.cc
===================================================================
--- runtime/vm/instructions_mips.cc	(revision 20788)
+++ runtime/vm/instructions_mips.cc	(working copy)
@@ -150,7 +150,11 @@
 
 
 void CallPattern::SetTargetAddress(uword target_address) const {
-  UNIMPLEMENTED();
+  ASSERT(Utils::IsAligned(target_address, 4));
+  // The address is stored in the object array as a RawSmi.
+  const Smi& smi = Smi::Handle(reinterpret_cast<RawSmi*>(target_address));
+  object_pool_.SetAt(target_address_pool_index_, smi);
+  // No need to flush the instruction cache, since the code is not modified.
 }