Fix non-optimized instanceof check after removal of signature classes.

runtime/vm/flow_graph_compiler_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/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 481 matching lines @@
         SubtypeTestCache::ZoneHandle(zone(),
             GenerateCallSubtypeTestStub(kTestTypeThreeArgs,
                                         kInstanceReg,
                                         kTypeArgumentsReg,
                                         kTempReg,
                                         is_instance_lbl,
                                         is_not_instance_lbl));
     __ Bind(&fall_through);
     return type_test_cache.raw();
   }
-  if (type.IsType()) {
+  if (type.IsType() || type.IsFunctionType()) {
     const Register kInstanceReg = R0;
     const Register kTypeArgumentsReg = R1;
     __ tsti(kInstanceReg, Immediate(kSmiTagMask));  // Is instance Smi?
     __ b(is_not_instance_lbl, EQ);
     __ ldr(kTypeArgumentsReg, Address(SP));  // Instantiator type args.
     // Uninstantiated type class is known at compile time, but the type
     // arguments are determined at runtime by the instantiator.
     const Register kTempReg = kNoRegister;
     return GenerateCallSubtypeTestStub(kTestTypeThreeArgs,
                                        kInstanceReg,
@@ skipping 1359 matching lines @@
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   __ PopDouble(reg);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64