Only keep the basics necessary to emit text lines in beemitter.[ch] and
move all the other convenience stuff to beemithlp.[ch].

We previously left the amd64_addr_t attribute uninitialized for OP_REG,
OP_REG_REG and OP_REG_IMM. Make the code more consistent by always
initializing it to the newly introduced X86_ADDR_REG variant, as a bonus
we can also use base_input member to indicate the register input instead
of hardcoding it to 0.

This function was deleted in 2007!

This allows us to properly implement the OS X calling conventions.

In case there also was a Shrs(x, 31),
CSE can be applied after instruction selection.

Otherwise the node directly produces the flags result.
This fixes backend/destam_flags4.c.

This resolves and out of bounds access.

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.