Embed Backtrace::Location objects

The struct is 16B, so they will use the 80B size pool, so on paper it
wastes 80 - 32 - 16 = 52B, however most malloc implementations will
either pad sizes or use an extra 16B for each segment, so in practice
the waste isn't that big. Also `Backtrace::Location` are rarely held
on for long, so avoiding the malloc churn help performance.

Co-Authored-By: Étienne Barrié <etienne.barrie@gmail.com>

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