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|NGFragmentItem| has a union. This change shows only the used
member of the union depending on its type.

|NGFragmentItems| has a flexible array. VS debugger could
show only the first item before this change. With this
change, synthetic |ArrayItems| shows all items.

Checked no warnings/errors with Natvis diagnostic messages
turned on in Tools/Options/Debugging/Output Window.

Bug: 982194
Change-Id: Ic5a75668c2e0482f7c6a00915459f6401886b9f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2294837Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789848}