[msvc] fix missing include <optional>

clang/clang-cl compiled happily (probably included transitively this
header), but not MSVC.

Bug: v8:13312

Change-Id: I69b6c15f76d8ef13e4fac33f733717429ba96f71
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3913033Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83402}

AUTHORS

@@ -208,6 +208,7 @@ Peter Rybin <peter.rybin@gmail.com>
 Peter Varga <pvarga@inf.u-szeged.hu>
 Peter Wong <peter.wm.wong@gmail.com>
 PhistucK <phistuck@gmail.com>
+Pierrick Bouvier <pierrick.bouvier@linaro.org>
 Rafal Krypa <rafal@krypa.net>
 Raul Tambre <raul@tambre.ee>
 Ray Glover <ray@rayglover.net>

test/cctest/test-assembler-arm64.cc

@@ -31,6 +31,7 @@
 
 #include <cmath>
 #include <limits>
+#include <optional>
 
 #include "src/base/utils/random-number-generator.h"
 #include "src/codegen/arm64/assembler-arm64-inl.h"