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The reloader never is a block.

bespillutil: Inline be_add_reload2() into its only caller be_add_reload(), which in turn only calls the former.

bemain: Centrally call be_gas_end_compilation_unit() and be_emit_exit() instead of doing it per backend.

Also remove the now write-only attribute main_env from struct arch_env_t.

bemain: Centrally call be_emit_init() and be_gas_begin_compilation_unit() instead of doing it per backend.

beemit: Provide be_emit_node(), which merges the (almost) identical node emit functions of the backends.

Also use one common be_emit_nothing().

bestate: Use be_get_end_of_block_insertion_point() instead of implementing something not entierly unlike it.

bespillslots: Use be_get_end_of_block_insertion_point() instead of implementing something not entierly unlike it.

This also handles the latent problem, that nobody checks, whether the user of a tuple is actually a Proj and not the End node.

Projs are not scheduled anymore.

All users check, that the blocks are equal, beforehand.