Implement the asan:stack statement

This statement allows programmers to reserve a memory range for the
stack. This is useful to reserve a memory region which is not attached
to any variable, and:

1. It is a way to safely reserve space on the $0100 page.
2. The --stats/--write-info flags will be able to add up the memory
   space reserved for the stack.
3. Future tooling might be able to use this value as a way to detect
   stack overflows.

Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>

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