Fix equality instruction to switch from checked (polymorphic) to megamorphic state. This helps da…

runtime/vm/intermediate_language_x64.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 290 matching lines @@
   if (is_checked_strict_equal) {
     const intptr_t kNumTemps = 1;
     LocationSummary* locs =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
     locs->set_in(0, Location::RequiresRegister());
     locs->set_in(1, Location::RequiresRegister());
     locs->set_temp(0, Location::RequiresRegister());
     locs->set_out(Location::RequiresRegister());
     return locs;
   }
-  if (HasICData() && (ic_data()->NumberOfChecks() > 0)) {
+  if (IsPolymorphic()) {
     const intptr_t kNumTemps = 1;
     LocationSummary* locs =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
     locs->set_in(0, Location::RegisterLocation(RCX));
     locs->set_in(1, Location::RegisterLocation(RDX));
     locs->set_temp(0, Location::RegisterLocation(RBX));
     locs->set_out(Location::RegisterLocation(RAX));
     return locs;
   }
   const intptr_t kNumTemps = 1;
@@ skipping 371 matching lines @@
     EmitDoubleComparisonOp(compiler, *locs(), kind(), kNoBranch);
     return;
   }
   const bool is_checked_strict_equal =
       HasICData() && ic_data()->AllTargetsHaveSameOwner(kInstanceCid);
   if (is_checked_strict_equal) {
     EmitCheckedStrictEqual(compiler, *ic_data(), *locs(), kind(), kNoBranch,
                            deopt_id());
     return;
   }
-  if (HasICData() && (ic_data()->NumberOfChecks() > 0)) {
+  if (IsPolymorphic()) {
     EmitGenericEqualityCompare(compiler, locs(), kind(), kNoBranch, *ic_data(),
                                deopt_id(), token_pos());
     return;
   }
   Register left = locs()->in(0).reg();
   Register right = locs()->in(1).reg();
   __ pushq(left);
   __ pushq(right);
   EmitEqualityAsInstanceCall(compiler,
                              deopt_id(),
@@ skipping 18 matching lines @@
     EmitDoubleComparisonOp(compiler, *locs(), kind(), branch);
     return;
   }
   const bool is_checked_strict_equal =
       HasICData() && ic_data()->AllTargetsHaveSameOwner(kInstanceCid);
   if (is_checked_strict_equal) {
     EmitCheckedStrictEqual(compiler, *ic_data(), *locs(), kind(), branch,
                            deopt_id());
     return;
   }
-  if (HasICData() && (ic_data()->NumberOfChecks() > 0)) {
+  if (IsPolymorphic()) {
     EmitGenericEqualityCompare(compiler, locs(), kind(), branch, *ic_data(),
                                deopt_id(), token_pos());
     return;
   }
   Register left = locs()->in(0).reg();
   Register right = locs()->in(1).reg();
   __ pushq(left);
   __ pushq(right);
   EmitEqualityAsInstanceCall(compiler,
                              deopt_id(),
@@ skipping 1546 matching lines @@
 
 void ShiftMintOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64