BugFixes:

BugFixes:
 - nodes must be initialized with Top not Bottom
 - right order for mode_X and mode_BB nodes
 - default_compute() assigns now U, R to mode_X nodes
 - cannot handle symconst_addr_name yet
 - compute_Phi() must check the predecessor block for U, because Firm constants live in the start block and are always != Top ...
 - removed the late on_* removement: its assumptions were wrong
 - set the node for newly created IR-nodes

Improvements:
 - ensure reachable End and EndBlock in apply_result()
 - can now replace ProjX(Cond) nodes by Jmp or Bad

Finally runs on Clicks example 3.1 :-)

[r20705]