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We already ship with a jinja2 equivalent anyways

Some instructions liks shifts or out/in can only handle some forms of
immediates. Make matchers respect that.

This fixes backend/ia32_shl.c, although the real question here is
probably why that program wasn't folded to a point where the middleend
would reduce the shift amount anyway because of the modulo shift mode.

Add callbacks on functions that really need them instead.

When creating an entity for a floatingpoint constant, first try to reduce the size, then check, whether it already exists.
This way only a single entity is created for e.g. a double and a float 1.0.

* Also only use the necessary number of bits.
* Improve its comment.

* Classify ',' as "no support" instead of "invalid".
* Ignore '!' and '?'.

* GCC does this, too.
* This is sensible, because they apply to all alternatives of a multi-alternative constraint.
* This simplifies the implementation and makes some flags obsolete.