[interpreter] Add support for scalable operands.

test/unittests/interpreter/constant-array-builder-unittest.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/v8.h"
 
 #include "src/factory.h"
 #include "src/handles-inl.h"
 #include "src/interpreter/constant-array-builder.h"
 #include "src/isolate.h"
@@ skipping 91 matching lines @@
       Handle<Object> object =
           isolate()->factory()->NewNumberFromSize(2 * k8BitCapacity + i);
       size_t index = builder.CommitReservedEntry(OperandSize::kByte, object);
       CHECK_EQ(static_cast<int>(index), k8BitCapacity - reserved + i);
       CHECK(builder.At(static_cast<int>(index))->SameValue(*object));
     }
     CHECK_EQ(builder.size(), 2 * k8BitCapacity + reserved);
   }
 }
 
-
-TEST_F(ConstantArrayBuilderTest, AllocateEntriesWithIdx16Reservations) {
+TEST_F(ConstantArrayBuilderTest, AllocateEntriesWithWideReservations) {
   for (size_t reserved = 1; reserved < k8BitCapacity; reserved *= 3) {
     ConstantArrayBuilder builder(isolate(), zone());
     for (size_t i = 0; i < k8BitCapacity; i++) {
       Handle<Object> object = isolate()->factory()->NewNumberFromSize(i);
       builder.Insert(object);
       CHECK(builder.At(i)->SameValue(*object));
       CHECK_EQ(builder.size(), i + 1);
     }
     for (size_t i = 0; i < reserved; i++) {
       OperandSize operand_size = builder.CreateReservedEntry();
@@ skipping 87 matching lines @@
     Handle<Object> original = builder.At(k8BitCapacity + i);
     CHECK(original->SameValue(*reference));
     Handle<Object> duplicate = builder.At(i);
     CHECK(duplicate->SameValue(*isolate()->factory()->the_hole_value()));
   }
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8