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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.

This adds two builtin kinds, ir_bk_va_start and ir_bk_va_arg. va_arg Builtins
are lowered in the lower_builtins pass with a function provided by the backend,
whereby most architectures can use be_default_lower_va_args. va_start Builtins
are lowered in the backend.

Note: This commit breaks all backends except for IA32. SPARC and AMD64 are
implemented in later commits. The ARM backend previously miscompiled variadic
functions, and will now throw a proper error.

The next release will feature a cmake build.

There is no node left that uses it.

This reverts commit 5165321c.

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

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

This reverts commit 7efc2374.

The function was used by the compiler lab reference compiler.

See 364d7fce for details.

Also provide a cleaner, better documented and slightly faster
implementation.

- block_strictly_dominates() is trivially to compute yourself anyway.
- free_dom() and free_postdom() did not free any memory anyway and the
  irg_properties handling is performed by confirm_irg_properties()
  anyway.

We only use control flow scc analysis.

- remove get_mode_nan() as there is not just a single NaN values but several
  different ones.
- introduce new_tarval_nan() which allows to construct signaling and
  quiet NaNs with payload.
- introduce tarval_is_snan() and tarval_is_qnan() to help unittests.

The tarval module is not the place to validate your input, leave that to
frontends and others... This way the code is simpler and slightly
faster.

Most inputs are little endian anyway and the few remaining users can
easily swap the bytes themselfes instead of having the function swap
them.