[RFC, ARM] later split of symbol_refs

[Dmitry Plotnikov]

2012/6/30 Georg-Johann Lay <gjl@gcc.gnu.org>:
> Is there a special reason to restrict it to SYMBOL_REF?
> Doesn't the same issue occur with, e.g.
> (const (plus (symbol_ref const_int))) or label_ref?

Hi!
We have added splits for symbol_ref plus const and label_ref.  With
this patch, assembly code and oprofile data look better,
but on SPEC2K INT it's about 3% slower than with split for only symbol_refs.
We will try to find later why this happens.
For now, we commited the original patch.
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