ia32: Simply make the fpcw caller (and callee) saved, so we do not need a special case when generating a call.

'mov $~0x80000000, %r; ror x, %r' is shorter than 'mov $0x80000000, %r; shr x, %r; not %r'.

'Or' cannot have float mode.

'mov $~1, %r; rol x, %r' is shorter than 'mov $1, %r; shl x, %r; not %r'.

The verifier has been broken and therefore unused for a while, remove it
for now.

At least __builtin_return_address(0) with -fomit-frame-pointer works
again (the variant with frame pointer is still broken).

'thunk' is the current and default style to get the ip.
'pop' is the old way using 'call base; base: pop %reg'.

Simply always set the registers of all outputs of the new Add.

The comment, stating that ia32_finish_irg_walker() starts more walks, is stale.
Therefore it is not necessary to first collect all nodes with a walker and then apply ia32_finish_irg_walker().

This fixes opt/fehler315.c

This fixes backend/chordal3.c.

This fixes backend/sparc_stackframe.

This fixes x86code/fehler132.c.

In particular, reduce the array size of the out_infos
instead of setting the flags register to NULL.

Size of last_uses has been increased and code is clear without the
comment anyway.

This reverts commit ccc99db0.

Without the assert it is easy to run into suble bugs because
be_get_backend_param() was called before all arguments are set by
be_parse_arg().

This fixes opt/fehler314.c.

This fixes backend/long_double_arith.c.