Try to fix a rare edges bug:
authorMichael Beck <beck@ipd.info.uni-karlsruhe.de>
Tue, 12 Jan 2010 22:27:48 +0000 (22:27 +0000)
committerMichael Beck <beck@ipd.info.uni-karlsruhe.de>
Tue, 12 Jan 2010 22:27:48 +0000 (22:27 +0000)
commit896321f0a34f3aed88c02b159d056ef7afc2ce41
tree5dcc11ef44fe81436d08dcbf5749772a5ff0e0a9
parent13590986df7ed5af2b9f4c34679969e262f75665
Try to fix a rare edges bug:
- if a node was built with edges disabled gets dead, but is revived by CSE when edges are enabled, it had NO edges
- tries to keep track of such dead nodes ...

[r26954]
ir/ir/iredges.c
ir/ir/iredges_t.h
ir/ir/irnode.c
ir/ir/iropt.c
ir/ir/irtypes.h