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Matze's cleanup broke things 8ebe31d226843d6f2cdfcc1ee100ca607c79ba65
Apparently, value==result shall be explicitly allowed, but in the case
of NaN, result was modified and afterwards a read from value returns the
wrong results. Fix was to move the reads before the writes.

Also, a cast from implicit one to explicit one forgot to set the one.
Likewise, the size comparison was oblivious of explicit ones.

Adds few more asserts.

Adds a unittest to check NaN payload stuff.

The optimization was disabled by 8e35902f.

It is only passed around recursively.

This makes the code a bit clearer.

This fixes opt/minus_zero.c.

The idea here, is that you do not simply set a target operating system
or architecture, but have a setting for all things different between the
operating systems. Knowledge about the name and habits of the operating
system is left to the frontend.
(We may want to provide a small support library in the future to share
the triple parsing and OS -> settings code between multiple frontends).

This reverts commit 5165321c.

lower_highlevel() is used by x10i.
Also, I'd argue we should rather deprecate lower_highlevel_graph
instead.

be: Factorise the code to emit an asm node and use a callback for each backend to output the operands.

Both functions do the same and the former is used way less.

create_compilerlib_entity() does it already, so it is not necessary to do it again in replace_with_call().