[tuples] [patch] use gsi_insert_before_without_update init_tmp_var

[Rafael Espindola]

When init_tmp_var runs, cfun is not set. This causes gsi_insert_before
to abort. This patch makes it use gsi_insert_before_without_update and
adds an assert that cfun != NULL down the line so that we get better
error message if it happens again.

It fixes 313 fortran tests!!

 * gcc/tree-ssa-operands.c (ssa_operands_active): Assert that cfun is not NULL.
 * gcc/tree-nested.c (init_tmp_var): Use
gsi_insert_before_without_update instead of  gsi_insert_before.

Cheers,
-- 
Rafael Avila de Espindola

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