VM: Fix identical comparisons with bigints.

runtime/vm/intermediate_language_x64.cc

 // Copyright (c) 2013, 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 "vm/dart_entry.h"
@@ skipping 4352 matching lines @@
 
 
 void CurrentContextInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   __ MoveRegister(locs()->out().reg(), CTX);
 }
 
 
 LocationSummary* StrictCompareInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
+  if (needs_number_check()) {
+    LocationSummary* locs =
+        new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
+    locs->set_in(0, Location::RegisterLocation(RAX));
+    locs->set_in(1, Location::RegisterLocation(RCX));
+    locs->set_out(Location::RegisterLocation(RAX));
+    return locs;
+  }
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::RegisterOrConstant(left()));
   locs->set_in(1, Location::RegisterOrConstant(right()));
   locs->set_out(Location::RequiresRegister());
   return locs;
 }
 
 
 // Special code for numbers (compare values instead of references.)
@@ skipping 187 matching lines @@
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64