[lsan] Disable annotations on windows

LSan is not implemented on windows, and trying to use the
{__lsan_ignore_object} function gives link error.
Since LSan is never enabled on windows, we also don't need the
annotations, so just disable them on windows.

R=bmeurer@chromium.org

Bug: chromium:842166,v8:7738
Change-Id: Ibaed77b4b884c09c7a08e081d953c56c53f907ff
Reviewed-on: https://chromium-review.googlesource.com/1056990Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53141}

src/lsan.h

@@ -12,19 +12,20 @@
 
 // There is no compile time flag for LSan, to enable this whenever ASan is
 // enabled. Note that LSan can be used as part of ASan with 'detect_leaks=1'.
-#ifdef V8_USE_ADDRESS_SANITIZER
+// On windows, LSan is not implemented yet, so disable it there.
+#if defined(V8_USE_ADDRESS_SANITIZER) && !defined(V8_OS_WIN)
 
 #include <sanitizer/lsan_interface.h>
 
 #define LSAN_IGNORE_OBJECT(ptr) __lsan_ignore_object(ptr)
 
-#else  // !V8_USE_ADDRESS_SANITIZER
+#else  // defined(V8_USE_ADDRESS_SANITIZER) && !defined(V8_OS_WIN)
 
 #define LSAN_IGNORE_OBJECT(ptr)                                                \
   static_assert(std::is_pointer<decltype(ptr)>::value ||                       \
                     std::is_same<v8::internal::Address, decltype(ptr)>::value, \
                 "static type violation")
 
-#endif  // V8_USE_ADDRESS_SANITIZER
+#endif  // defined(V8_USE_ADDRESS_SANITIZER) && !defined(V8_OS_WIN)
 
 #endif  // V8_LSAN_H_