Fix FreeList::zapFreedMemory to fail "use-of-uninitialized-value" on MSAN

Source/wtf/AddressSanitizer.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WTF_AddressSanitizer_h
 #define WTF_AddressSanitizer_h
+// TODO(kojii): This file will need to be renamed, because it's no more
+// specific to AddressSanitizer.
 
 // TODO(sof): Add SyZyASan support?
 #if defined(ADDRESS_SANITIZER)
 #include <sanitizer/asan_interface.h>
 #else
 #define ASAN_POISON_MEMORY_REGION(addr, size)   \
     ((void)(addr), (void)(size))
 #define ASAN_UNPOISON_MEMORY_REGION(addr, size) \
     ((void)(addr), (void)(size))
 #endif
 
 #if defined(LEAK_SANITIZER)
 #include <sanitizer/lsan_interface.h>
 #else
 #define __lsan_register_root_region(addr, size) ((void)(addr), (void)(size))
 #define __lsan_unregister_root_region(addr, size) ((void)(addr), (void)(size))
 #endif
 
+#if defined(MEMORY_SANITIZER)
+#include <sanitizer/msan_interface.h>
+#endif
+
 // TODO(sof): Have to handle (ADDRESS_SANITIZER && _WIN32) differently as it
 // uses both Clang (which supports the __attribute__ syntax) and CL (which doesn't)
 // as long as we use "clang-cl /fallback". This shouldn't be needed when Clang
 // handles all the code without falling back to CL.
 #if defined(ADDRESS_SANITIZER) && (!OS(WIN) || COMPILER(CLANG))
 #define NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
 #if ENABLE(LAZY_SWEEPING)
 #define NO_LAZY_SWEEP_SANITIZE_ADDRESS NO_SANITIZE_ADDRESS
 #else
 #define NO_LAZY_SWEEP_SANITIZE_ADDRESS
 #endif
 #else
 #define NO_SANITIZE_ADDRESS
 #define NO_LAZY_SWEEP_SANITIZE_ADDRESS
 #endif
 
+#if defined(MEMORY_SANITIZER) && (!OS(WIN) || COMPILER(CLANG))
+#define NO_SANITIZE_MEMORY __attribute__((no_sanitize_memory))
+#else
+#define NO_SANITIZE_MEMORY
+#endif
+
 #endif // WTF_AddressSanitizer_h