[tree-ssa] Can not compile correctly on ia64 with -O1 option.

[Feng Wang]

Hi,
  The attached C file can not be compiled correctly on ia64-linux with -O1
option. On i686, it is OK. It seems to run into a dead cycle. I am not back-end
hacker and can not find more about this bug. Sorry for little information.
Reported in bugzilla with ID 14109.

Feng Wang

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