[turbofan] Fix write barrier handling of map values.

src/compiler/arm64/code-generator-arm64.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/code-generator.h"
 
 #include "src/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 267 matching lines @@
         index_(index),
         value_(value),
         scratch0_(scratch0),
         scratch1_(scratch1),
         mode_(mode) {}
 
   void Generate() final {
     if (mode_ > RecordWriteMode::kValueIsPointer) {
       __ JumpIfSmi(value_, exit());
     }
-    if (mode_ > RecordWriteMode::kValueIsMap) {
-      __ CheckPageFlagClear(value_, scratch0_,
-                            MemoryChunk::kPointersToHereAreInterestingMask,
-                            exit());
-    }
+    __ CheckPageFlagClear(value_, scratch0_,
+                          MemoryChunk::kPointersToHereAreInterestingMask,
+                          exit());
     SaveFPRegsMode const save_fp_mode =
         frame()->DidAllocateDoubleRegisters() ? kSaveFPRegs : kDontSaveFPRegs;
     if (!frame()->needs_frame()) {
       // We need to save and restore lr if the frame was elided.
       __ Push(lr);
     }
     RecordWriteStub stub(isolate(), object_, scratch0_, scratch1_,
                          EMIT_REMEMBERED_SET, save_fp_mode);
     __ Add(scratch1_, object_, index_);
     __ CallStub(&stub);
@@ skipping 1421 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8