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If the MiraclePtr PA extras are enabled, Alloc() returns a pointer
past the end of a slot for zero-sized allocations, which leads to
problems when a function needs to determine the slot from a given
pointer.

Adjust the requested allocation size to avoid that.

Bug: 1162769
Change-Id: I7c398a99a257f443ef704b87ac188acef0bcc5a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2613974
Auto-Submit: Sergei Glazunov <glazunov@google.com>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841381}