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[PING] INSN attribute to enable/disable alternatives


these 3 patches introduce a new special attribute to be used in INSN
definitions in order to enable or disable certain INSN alternatives.
I think this comes in quite handy when enhancing a back end with new

Other GCC developers have already agreed that this is a useful
feature.  What's left is to check the implementation.  So could please
someone have a look at it?

The first of the patches shows how that features might be used by a
back end to significantly reduce duplicated patterns for different CPU
types.  This patch only addresses the most obvious cases.

[UPDATE] These patches are required for the upcoming patchset supporting
the latest and greatest mainframe z10. So I really need a decision
about that.

I've verified that the patches still work with current GCC.

[PATCH 1/3] S/390: New `enabled' insn attribute

[PATCH 2/3] reload,recog: New `enabled' insn attribute

[PATCH 3/3] genattr: New `enabled' insn attribute

OK for mainline?



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