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[patch] remove superfluous sets to SSA_NAME_DEF_STMT

SSA_NAME_DEF_STMT is set by default in gimple_build_assign(), by virtue of gimple_assign_set_lhs: 


static inline void
gimple_assign_set_lhs (gimple gs, tree lhs)
{
  GIMPLE_CHECK (gs, GIMPLE_ASSIGN);
  gimple_set_op (gs, 0, lhs);

  if (lhs && TREE_CODE (lhs) == SSA_NAME)
    SSA_NAME_DEF_STMT (lhs) = gs;
}
This patch removes all the unnecessary sets to SSA_NAME_DEF_STMT in the compiler. 

Tested on x86-64 Linux.

OK for trunk?

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