glsl ubo/ssbo: Move common code into lower_buffer_access::setup_buffer_access

This code will also be usable by the pass to lower shared variables.

Note, that *const_offset is adjusted by setup_buffer_access so it must
be initialized before calling setup_buffer_access.

v2:
 * Add comment for lower_buffer_access::setup_buffer_access

Signed-off-by: Jordan Justen <[email protected]>
Reviewed-by: Iago Toral Quiroga <[email protected]>
Reviewed-by: Kristian Høgsberg <[email protected]>

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