TestHeapRootsNotReadOnly was mistakenly checking for exceptions to the
rule by comparing the value of the root rather than the address. Since
several roots point to UndefinedValue, this meant that only one of the
matching roots had to be in the list.

This fixes it by instead getting a Handle from Factory and using the
address() method to check whether the roots match the exception list.

Also adds detached_contexts, feedback_vectors_for_profiling_tools,
microtask_queue, serialized_global_proxy_sizes and serialized_objects to
the exception list now that the test is working properly.

Change-Id: I599d584f94797a256d1c8c24c0fa2848ca1ca1df
Reviewed-on: https://chromium-review.googlesource.com/1148331
Commit-Queue: Dan Elphick <delphick@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54647}