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unknown_type, code_type, none_type, unknown_entity reference are hold in
the irprog now. This makes handling more consistent since now all types
and entities are equally part of irprog.

public functions are already documented in their headers, no need to
repeat the comment at the definition site.

This is the new way of handling switch-jumps. The node contains a table
which maps (ranges of) input values to proj numbers. Compared to a
Cond-node this results in a clean consecutive sequence of Proj numbers
(no searching for a free number for the default_pn anymore) and allows
factoring multiple cases jumping to the same block in a single Proj
(though we still need the optimisation in cfopt for that).

Newer yComp (>= 1.3.14) can handle backslashes in strings.

Dump array initialisers, which contain only bytes in the printable range, as strings instead of separate byte initialisers.

Eg.
[0] = 0x62
[1] = 0x6C
[2] = 0x61
[3] = 0x00]
becomes
[0...3] = "bla<NUL>"

TODO: Fix yComp, so it does not choke on backslashes.

Noone is really using these informations at the moment and they weren't
correctly invalidated anyway.

optimize_graph_df: iterate marking of unreachable blocks to guarantee that all unreachable code is killed

[r28340]

[r28337]

[r28090]

[r28062]

[r28043]

[r28020]

[r27762]

[r27653]

[r27552]