gen_ir: remove (unused) possibility to specify output numbers manually in generator script
gen_ir: Rework Input/Output specification
gen_ir: Only set default mode to mode_T if multiple outputs are specified
gen_ir: make pinned="no" the default
remove pointless config.mak.example
further cleanup, improvements to build.ninja generator
Remove a few pointless tests
Remove get_Block_cfgpred_pos(), introduce get_Block_cfg_out_ex() instead
iropt: Use set_op_xxx instead of custom functions
reassoc: Use set_op_reassociate() instead of custom function
irverify: Use set_op_verify() instead of custom function
irnode: Use set_op_get_{type_attr|entity_func}() instead of custom function
Avoid direct op->ops accesses
no need to set floating in proj transformer, main one already did that
Forbid Cmp, Store, Load, Call with mode_b args
remove unused fprem node