Suppress incorrect warning

src/objects-inl.h

 // Copyright 2012 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 946 matching lines @@
   Handle<Object> AsHandle(Isolate* isolate) override;
 };
 
 class SeqOneByteSubStringKey : public HashTableKey {
  public:
   SeqOneByteSubStringKey(Handle<SeqOneByteString> string, int from, int length)
       : string_(string), from_(from), length_(length) {
     DCHECK(string_->IsSeqOneByteString());
   }
 
+// VS 2017 on official builds gives this spurious warning:
+// warning C4789: buffer 'key' of size 16 bytes will be overrun; 4 bytes will
+// be written starting at offset 16
+// https://bugs.chromium.org/p/v8/issues/detail?id=6068
+#if defined(V8_CC_MSVC)
+#pragma warning(push)
+#pragma warning(disable : 4789)
+#endif
   uint32_t Hash() override {
     DCHECK(length_ >= 0);
     DCHECK(from_ + length_ <= string_->length());
     const uint8_t* chars = string_->GetChars() + from_;
     hash_field_ = StringHasher::HashSequentialString(
         chars, length_, string_->GetHeap()->HashSeed());
     uint32_t result = hash_field_ >> String::kHashShift;
     DCHECK(result != 0);  // Ensure that the hash value of 0 is never computed.
     return result;
   }
+#if defined(V8_CC_MSVC)
+#pragma warning(pop)
+#endif
 
   uint32_t HashForObject(Object* other) override {
     return String::cast(other)->Hash();
   }
 
   bool IsMatch(Object* string) override;
   Handle<Object> AsHandle(Isolate* isolate) override;
 
  private:
   Handle<SeqOneByteString> string_;
@@ skipping 7282 matching lines @@
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_INL_H_