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This should fix all known bugs, make the code easier to read and more
robust.

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).

They are reserved in ANSI-C so instead of _XXX we use XXX_ now.

- The pns of X_regular and X_except are annotated in the opcode now.
- The memory input is annotated in the opcode now
- only nodes with X_regular, X_except are marked fragile

See http://www.libfirm.org/Unreachable_Code for details

add unknown_jump opflag for the special case of a jump where we can't directly influence the destination and can't predict/change them

[r28457]

[r28346]

[r28345]