VM: Remove unreachable code from the code generator.

runtime/vm/intermediate_language_mips.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_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 4217 matching lines @@
 }
 
 
 LocationSummary* PolymorphicInstanceCallInstr::MakeLocationSummary(
     Isolate* isolate, bool opt) const {
   return MakeCallSummary();
 }
 
 
 void PolymorphicInstanceCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  Label* deopt = compiler->AddDeoptStub(
-      deopt_id(), ICData::kDeoptPolymorphicInstanceCallTestFail);
   __ TraceSimMsg("PolymorphicInstanceCallInstr");
-  if (ic_data().NumberOfChecks() == 0) {
-    __ b(deopt);
-    return;
-  }
   ASSERT(ic_data().NumArgsTested() == 1);
   if (!with_checks()) {
     ASSERT(ic_data().HasOneTarget());
     const Function& target = Function::ZoneHandle(ic_data().GetTargetAt(0));
     compiler->GenerateStaticCall(deopt_id(),
                                  instance_call()->token_pos(),
                                  target,
                                  instance_call()->ArgumentCount(),
                                  instance_call()->argument_names(),
                                  locs(),
                                  ICData::Handle());
     return;
   }
 
   // Load receiver into T0.
   __ lw(T0, Address(SP, (instance_call()->ArgumentCount() - 1) * kWordSize));
 
+  Label* deopt = compiler->AddDeoptStub(
+      deopt_id(), ICData::kDeoptPolymorphicInstanceCallTestFail);
   LoadValueCid(compiler, T2, T0,
                (ic_data().GetReceiverClassIdAt(0) == kSmiCid) ? NULL : deopt);
 
   compiler->EmitTestAndCall(ic_data(),
                             T2,  // Class id register.
                             instance_call()->ArgumentCount(),
                             instance_call()->argument_names(),
                             deopt,
                             deopt_id(),
                             instance_call()->token_pos(),
@@ skipping 646 matching lines @@
   compiler->GenerateCall(token_pos(), &label, stub_kind_, locs());
 #if defined(DEBUG)
   __ LoadImmediate(S4, kInvalidObjectPointer);
   __ LoadImmediate(S5, kInvalidObjectPointer);
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS