[turbofan] Fix more -Wsign-compare warnings.

src/code-stub-assembler.cc

 // Copyright 2016 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/code-stub-assembler.h"
 #include "src/code-factory.h"
 #include "src/frames-inl.h"
 #include "src/frames.h"
 #include "src/ic/handler-configuration.h"
 #include "src/ic/stub-cache.h"
 
@@ skipping 5410 matching lines @@
         int16_elements(this), uint32_elements(this), int32_elements(this),
         float32_elements(this), float64_elements(this);
     Label* elements_kind_labels[] = {
         &uint8_elements,  &uint8_elements,   &int8_elements,
         &uint16_elements, &int16_elements,   &uint32_elements,
         &int32_elements,  &float32_elements, &float64_elements};
     int32_t elements_kinds[] = {
         UINT8_ELEMENTS,  UINT8_CLAMPED_ELEMENTS, INT8_ELEMENTS,
         UINT16_ELEMENTS, INT16_ELEMENTS,         UINT32_ELEMENTS,
         INT32_ELEMENTS,  FLOAT32_ELEMENTS,       FLOAT64_ELEMENTS};
-    const int kTypedElementsKindCount = LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND -
-                                        FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND +
-                                        1;
+    const size_t kTypedElementsKindCount =
+        LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND -
+        FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND + 1;
     DCHECK_EQ(kTypedElementsKindCount, arraysize(elements_kinds));
     DCHECK_EQ(kTypedElementsKindCount, arraysize(elements_kind_labels));
     Switch(elements_kind, miss, elements_kinds, elements_kind_labels,
-           static_cast<size_t>(kTypedElementsKindCount));
+           kTypedElementsKindCount);
     Bind(&uint8_elements);
     {
       Comment("UINT8_ELEMENTS");  // Handles UINT8_CLAMPED_ELEMENTS too.
       Return(SmiTag(Load(MachineType::Uint8(), backing_store, intptr_index)));
     }
     Bind(&int8_elements);
     {
       Comment("INT8_ELEMENTS");
       Return(SmiTag(Load(MachineType::Int8(), backing_store, intptr_index)));
     }
@@ skipping 3462 matching lines @@
 }
 
 void CodeStubArguments::PopAndReturn(compiler::Node* value) {
   assembler_->PopAndReturn(
       assembler_->IntPtrAddFoldConstants(argc_, assembler_->IntPtrConstant(1)),
       value);
 }
 
 }  // namespace internal
 }  // namespace v8