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memops are nodes that have memory inputs, you can generically query them
for their memory input. We can also get rid of get_fragile_op_mem in
favor of get_memop_mem.

We simply always assume that Sel can only return a null pointer if
its input is a null pointer.

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).

- 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

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]

[r28237]

[r28236]

[r28235]

[r28234]

remove the 'special-constructor' feature. This removes a bunch of strange exceptions in the node generation scripts

[r28233]

[r28232]

[r28231]

you can specify in the spec now for which nodes no standard import/export code is generated; fix bug with Proj nodes block

[r28215]

[r28116]