irgmod: Pass the new inputs to turn_into_tuple() instead of initialising them with Bad and setting them afterwards.

Avoid negative switches.

Infer it from block.

cleanup: Remove pointless assert(is_${NODE}(x)) just before get_${NODE}_${FOO}(x), which do the same assert.

That way the spill engine can rematerialize the loads and needs no
extra spills for these values.

The reload/spill is always scheduled, because we found it in the schedule.

This corrects handling in bestate (non-ignore).
beabi attaches the fpcw to Start/Return due to being callee-save.
This was accidently done before due to being ignored.

This resolves a latent bug that the x87 noreg register was classified as caller save.
The local index of the given register was compared to the global index of the x87 noreg.

ia32: When emitting an asm memory operand, ignore the size of the referenced value and asm operand size modifier.

The register, which is emitted, contains the address of the value, so it always is the size of a pointer, not whatever the register points to.

It does not provide sufficient information to handle float in asm.

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().