[PATCH 0/2] Move xx* builtins to vsx.md.

I noticed that the xx built-in functions (xxspltiw, xxspltidp, xxsplti32dx,
xxeval, xxblend, and xxpermx) were all defined in altivec.md.  However, since
the XX instructions can take both traditional floating point and Altivec
registers, these built-in functions should be in vsx.md.

The first patch just moves the insns from altivec.md to vsx.md.

The second patch fixes a predicate error that I noticed when was doing the
error.

I also moved the VM3 mode iterator and VM3_char mode attribute from altivec.md
to vsx.md, since the only use of these were for the XXBLEND insns.

I have bootstraped this on LE power9 and BE power8 systems.  There were no
regressions.  Can I check this into the trunk?

It does not need to be backported to GCC 11 unless we want to back port the
support for XXSPLTIW, XXSPLTIDP, and XXSPLTI32DX instructions that will be
later patches.

-- 
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meiss...@linux.ibm.com, phone: +1 (978) 899-4797

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