[tuples][patch] Converting several easy passes

[Jakub Staszak]

This patch enables pass_simple_dse, which was already tuplified, but  
it was
#if0'ed because it caused huge number of regressions. Tested on Compile
Farm (amd64-linux), no regressions.


   * tree-ssa-dse.c (execute_simple_dse): #if 0 removed,  
bitmap_empty_p condition
   added.
   * passes.c (init_optimization_passes): pass_simple_dse enabled.

-- 
Jakub Staszak
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