[tuples] Add gimple_has_side_effects

[Diego Novillo]

All the uses of TREE_SIDE_EFFECTS in the middle-end do not really make
a lot of sense.  Mostly, it is used for statements that have volatile
operands, operands that have TREE_SIDE_EFFECTS set or for calls that
are not marked pure/const.

Eventually, we have to phase out this ill-defined predicate.  For now,
there is a new gimple_has_side_effects() predicate that centralizes
all these decisions.  This prevents the need for these odd calls to
recalculate_side_effects.  New code that is converted to tuples should
use this new predicate instead of TREE_SIDE_EFFECTS.

Tested on x86.


Diego.
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