[stubs] Port LoadIndexedStringStub to CSA

src/builtins/builtins-string.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/builtins/builtins-regexp.h"
 #include "src/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/regexp/regexp-utils.h"
@@ skipping 399 matching lines @@
 TF_BUILTIN(StringGreaterThanOrEqual, StringBuiltinsAssembler) {
   GenerateStringRelationalComparison(
       RelationalComparisonMode::kGreaterThanOrEqual);
 }
 
 TF_BUILTIN(StringCharAt, CodeStubAssembler) {
   Node* receiver = Parameter(0);
   Node* position = Parameter(1);
 
   // Load the character code at the {position} from the {receiver}.
-  Node* code = StringCharCodeAt(receiver, position,
-                                CodeStubAssembler::INTPTR_PARAMETERS);
+  Node* code = StringCharCodeAt(receiver, position, INTPTR_PARAMETERS);
 
   // And return the single character string with only that {code}
   Node* result = StringFromCharCode(code);
   Return(result);
 }
 
 TF_BUILTIN(StringCharCodeAt, CodeStubAssembler) {
   Node* receiver = Parameter(0);
   Node* position = Parameter(1);
 
   // Load the character code at the {position} from the {receiver}.
-  Node* code = StringCharCodeAt(receiver, position,
-                                CodeStubAssembler::INTPTR_PARAMETERS);
+  Node* code = StringCharCodeAt(receiver, position, INTPTR_PARAMETERS);
 
   // And return it as TaggedSigned value.
   // TODO(turbofan): Allow builtins to return values untagged.
   Node* result = SmiFromWord32(code);
   Return(result);
 }
 
 // -----------------------------------------------------------------------------
 // ES6 section 21.1 String Objects
 
@@ skipping 1428 matching lines @@
         CallRuntime(Runtime::kThrowIncompatibleMethodReceiver, context,
                     HeapConstant(factory()->NewStringFromAsciiChecked(
                         "String Iterator.prototype.next", TENURED)),
                     iterator);
     Return(result);  // Never reached.
   }
 }
 
 }  // namespace internal
 }  // namespace v8