[turbofan] Remove dead code (related to the SeqStringChar lowering removal).

src/compiler/access-builder.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/access-builder.h"
 
 #include "src/contexts.h"
 #include "src/frames.h"
 #include "src/heap/heap.h"
 #include "src/type-cache.h"
@@ skipping 287 matching lines @@
       return access;
     }
   }
   UNREACHABLE();
   ElementAccess access = {kUntaggedBase, 0, Type::None(), kMachNone};
   return access;
 }
 
 
 // static
-ElementAccess AccessBuilder::ForSeqStringChar(String::Encoding encoding) {
-  switch (encoding) {
-    case String::ONE_BYTE_ENCODING: {
-      ElementAccess access = {kTaggedBase, SeqString::kHeaderSize,
-                              Type::Unsigned32(), kMachUint8};
-      return access;
-    }
-    case String::TWO_BYTE_ENCODING: {
-      ElementAccess access = {kTaggedBase, SeqString::kHeaderSize,
-                              Type::Unsigned32(), kMachUint16};
-      return access;
-    }
-  }
-  UNREACHABLE();
-  ElementAccess access = {kUntaggedBase, 0, Type::None(), kMachNone};
-  return access;
-}
-
-
-// static
 FieldAccess AccessBuilder::ForStatsCounter() {
   FieldAccess access = {kUntaggedBase, 0, MaybeHandle<Name>(),
                         TypeCache::Get().kInt32, kMachInt32};
   return access;
 }
 
 
 // static
 FieldAccess AccessBuilder::ForFrameCallerFramePtr() {
   FieldAccess access = {kUntaggedBase, StandardFrameConstants::kCallerFPOffset,
                         MaybeHandle<Name>(), Type::Internal(), kMachPtr};
   return access;
 }
 
 
 // static
 FieldAccess AccessBuilder::ForFrameMarker() {
   FieldAccess access = {kUntaggedBase, StandardFrameConstants::kMarkerOffset,
                         MaybeHandle<Name>(), Type::Tagged(), kMachAnyTagged};
   return access;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8