[turbofan] Fix several int vs size_t issues.

src/compiler/instruction-selector.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/instruction-selector.h"
 
 #include <limits>
 
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 380 matching lines @@
             callee->opcode() == IrOpcode::kInt64Constant))
               ? g.UseImmediate(callee)
               : g.UseRegister(callee));
       break;
     case CallDescriptor::kCallJSFunction:
       buffer->instruction_args.push_back(
           g.UseLocation(callee, buffer->descriptor->GetInputLocation(0),
                         buffer->descriptor->GetInputType(0)));
       break;
   }
-  DCHECK_EQ(1, static_cast<int>(buffer->instruction_args.size()));
+  DCHECK_EQ(1u, buffer->instruction_args.size());
 
   // If the call needs a frame state, we insert the state information as
   // follows (n is the number of value inputs to the frame state):
   // arg 1               : deoptimization id.
   // arg 2 - arg (n + 1) : value inputs to the frame state.
   if (buffer->frame_state_descriptor != NULL) {
     InstructionSequence::StateId state_id =
         sequence()->AddFrameStateDescriptor(buffer->frame_state_descriptor);
     buffer->instruction_args.push_back(g.TempImmediate(state_id.ToInt()));
 
@@ skipping 801 matching lines @@
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   return MachineOperatorBuilder::Flag::kNoFlags;
 }
 
 #endif  // !V8_TURBOFAN_BACKEND
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8