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This commit also abstracts the node types used for fxch/fdup/fpop/ffreep
by using callbacks in the x87_simulator_config.

mode_E is only 10 bytes wide but we should still use the 12byte wide
type_E for better alignment/consistency.

It is barely used but cross cuts into most libfirm components and
therefore isn't maintenance free.

The statev framework stays obviously.

We can see that we need a frame entity if the the immediate has a
X86_IMM_FRAMEOFFSET relocation but no entity assigned yet.

Maybe we should also rename "opt" to "trans" in the future...

Just use the code present in the Cmp/Sub-optimization to see if it will
trigger.

This fixes opt/fehler304.c