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Also remove the nonsensical parameter pn, which is the Proj num of the old flags producer, from the try_replace callback.

The Proj might exist already, so reuse it.
If it needs to be created, then do this once, not once per flags uers.

In this case the list of flags uers was erroneously reset.
But the new flags producer is not definitely available, so it might be necessary to rewire the users again.

This removes the special cases in amd64_has_addr_attr(), which corrected for the wrong op_mode.

Now the pos for fetching an out info is checked in all cases.

This fixes backend/amd64_sub2.c.

There is only an fstp variant for storing 80bit float values. Introduce
a special fstp node so we can already create the the fixup copies in the
spillprepare phase.

There is only the fistp variant for 64bit integer stores. Introduce a
special fistp node so we can already create the fixup copies in the
spillprepare phase and avoid the fixup code in the x87 simulator which
was also wrong for the fist case.

The kills value constraint indicated that the value in a register is
modified after it is read. A copy is inserted if the value is still
required after a kills_value use.

Properly use get_irn_pinned/set_irn_pinned as bool value instead of
comparing setting the ir_op enum values.

bescripts: Use the single register requirements provided by regalloc instead of generating duplicate ones for new nodes.

bescripts: Use the class requirements provided by regalloc instead of generating duplicate ones for new nodes.

The generator chooses the right default automatically.

All backends had identical implementations.
Now rematerialization works out of the box for new backends.

Now add_pressure[] is copied.

Actually, I just want to trigger the buildbot and see if my fix worked.

Avoid using the op_pin_state enum as that contains confusing additional
entries that are not valid on a node. The only remaining state for a
node is pinned/floating which we can simply represent with a 0/1 value.