[patch] Move and rename compute_idf

[Steven Bosscher]

Hi,

The attached patch moves compute_idf from tree-into-ssa.c to
cfganal.c, and renames it to compute_iterative_dominance_frontiers
(which seems appropriate now that it's not a local function anymore).

En passant the patch removes from insert_phi_nodes_for a redundant
check for SSA_NAME.  Just a few lines up, there is an "if
(TREE_CODE(var) == SSA_NAME)" path, so var can't be an SSA_NAME in the
else-branch of that if ;-)

OK for the trunk?

Gr.
Steven
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