gas: Compile variable expression with scope support

This patch adds the variable compilation and uses a scope (a stack of
map) to lookup for identities.

Today we use a vector + ref_entry structs in order to achieve the scope
implementation. The ref_entry lacks memory management, we are still no
sure who will be the owner of the pointer.

We also want to replace the scope a hashtable_t type as soon as we get
one.

Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Co-authored-by: Carlos Maniero <carlosmaniero@gmail.com>

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