[turbofan] Fix several int vs size_t issues.

src/compiler/ia32/instruction-selector-ia32.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-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 444 matching lines @@
 }
 
 void EmitLea(InstructionSelector* selector, Node* result, Node* index,
              int scale, Node* base, Node* displacement) {
   IA32OperandGenerator g(selector);
   InstructionOperand inputs[4];
   size_t input_count = 0;
   AddressingMode mode = g.GenerateMemoryOperandInputs(
       index, scale, base, displacement, inputs, &input_count);
 
-  DCHECK_NE(0, static_cast<int>(input_count));
+  DCHECK_NE(0u, input_count);
   DCHECK_GE(arraysize(inputs), input_count);
 
   InstructionOperand outputs[1];
   outputs[0] = g.DefineAsRegister(result);
 
   InstructionCode opcode = AddressingModeField::encode(mode) | kIA32Lea;
 
   selector->Emit(opcode, 1, outputs, input_count, inputs);
 }
 
@@ skipping 32 matching lines @@
 
   // Try to match the Add to a lea pattern
   BaseWithIndexAndDisplacement32Matcher m(node);
   if (m.matches() &&
       (m.displacement() == NULL || g.CanBeImmediate(m.displacement()))) {
     InstructionOperand inputs[4];
     size_t input_count = 0;
     AddressingMode mode = g.GenerateMemoryOperandInputs(
         m.index(), m.scale(), m.base(), m.displacement(), inputs, &input_count);
 
-    DCHECK_NE(0, static_cast<int>(input_count));
+    DCHECK_NE(0u, input_count);
     DCHECK_GE(arraysize(inputs), input_count);
 
     InstructionOperand outputs[1];
     outputs[0] = g.DefineAsRegister(node);
 
     InstructionCode opcode = AddressingModeField::encode(mode) | kIA32Lea;
     Emit(opcode, 1, outputs, input_count, inputs);
     return;
   }
 
@@ skipping 547 matching lines @@
            MachineOperatorBuilder::kFloat64Ceil |
            MachineOperatorBuilder::kFloat64RoundTruncate |
            MachineOperatorBuilder::kWord32ShiftIsSafe;
   }
   return MachineOperatorBuilder::Flag::kNoFlags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8