Added functionality to irgmod:
  * collect all Phi nodes as link-list in th eBlocks link field
  * collect all Proj nodes as link-list in node productin the tuple
  * Seperate a Block into two
  Added inlining transformation in irgopt.h
  Improved output of dump_ir_block_graph.  Now also dumps nodes that
  don't belong to a block.
  Added flag opt_unreachable_code, opt_inline.
  Changed irvrfy so that it accepts nodes with Bad predecessors.

[r272]