Enables GVN for MIPS32 and MIPS64.

Test: mma test-art-host-gtest
Test: mma test-art-target-gtest in QEMU
Test: ./testrunner.py --target --optimizing in QEMU

Change-Id: Ie3c6b29b9125ff8aef888c3574bdb0ab96574bd4
diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index 8dd2762..2305cef 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -670,13 +670,29 @@
     case kMips: {
       mips::PcRelativeFixups* pc_relative_fixups =
           new (arena) mips::PcRelativeFixups(graph, codegen, stats);
+      SideEffectsAnalysis* side_effects = new (arena) SideEffectsAnalysis(graph);
+      GVNOptimization* gvn = new (arena) GVNOptimization(graph, *side_effects, "GVN$after_arch");
       HOptimization* mips_optimizations[] = {
+          side_effects,
+          gvn,
           pc_relative_fixups,
       };
       RunOptimizations(mips_optimizations, arraysize(mips_optimizations), pass_observer);
       break;
     }
 #endif
+#ifdef ART_ENABLE_CODEGEN_mips64
+    case kMips64: {
+      SideEffectsAnalysis* side_effects = new (arena) SideEffectsAnalysis(graph);
+      GVNOptimization* gvn = new (arena) GVNOptimization(graph, *side_effects, "GVN$after_arch");
+      HOptimization* mips64_optimizations[] = {
+          side_effects,
+          gvn,
+      };
+      RunOptimizations(mips64_optimizations, arraysize(mips64_optimizations), pass_observer);
+      break;
+    }
+#endif
 #ifdef ART_ENABLE_CODEGEN_x86
     case kX86: {
       x86::PcRelativeFixups* pc_relative_fixups =