VM: Remove unused optimization of merging of sin/cos.

runtime/vm/intermediate_language_arm64.cc

 // Copyright (c) 2014, 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_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/compiler.h"
@@ skipping 5361 matching lines @@
     __ CompareRegisters(result_mod, ZR);
     __ b(&done, GE);
     // Result is negative, adjust it.
     __ CompareRegisters(right, ZR);
     __ sub(TMP2, result_mod, Operand(right));
     __ add(TMP, result_mod, Operand(right));
     __ csel(result_mod, TMP, TMP2, GE);
     __ Bind(&done);
     return;
   }
-  if (kind() == MergedMathInstr::kSinCos) {
-    UNIMPLEMENTED();
-  }
   UNIMPLEMENTED();
 }
 
 
 LocationSummary* PolymorphicInstanceCallInstr::MakeLocationSummary(
     Zone* zone,
     bool opt) const {
   return MakeCallSummary(zone);
 }
 
@@ skipping 625 matching lines @@
   compiler->GenerateRuntimeCall(TokenPosition::kNoSource, deopt_id(),
                                 kGrowRegExpStackRuntimeEntry, 1, locs());
   __ Drop(1);
   __ Pop(result);
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64