[patch part, libgcc] Add AVX-specific matmul

[Thomas Koenig]

Hello world,

the patch at https://gcc.gnu.org/ml/fortran/2016-11/msg00246.html
(the one going to gcc-patches was rejected due to size of
regernerated files) contains one libgcc change, which exposes
the __cpu_model interface fox i386 to libgfortran.

The Fortran bits are OKd, but I need an approval from a libgcc
maintainer (or some hint how to do this better :-).

I have attached the libgcc-specific part of the patch.

OK for trunk?

Regards

	Thomas

2016-11-27  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/78379
         * config/i386/cpuinfo.c:  Move denums for processor vendors,
         processor type, processor subtypes and declaration of
         struct __processor_model into
         * config/i386/cpuinfo.h:  New header file.
         * Makefile.am:  Add dependence of m4/matmul_internal_m4 to
         mamtul files..
         * Makefile.in:  Regenerated.
         * acinclude.m4:  Check for AVX, AVX2 and AVX512F.
         * config.h.in:  Add HAVE_AVX, HAVE_AVX2 and HAVE_AVX512F.
         * configure:  Regenerated.
         * configure.ac:  Use checks for AVX, AVX2 and AVX_512F.
         * m4/matmul_internal.m4:  New file. working part of matmul.m4.
         * m4/matmul.m4:  Implement architecture-specific switching
         for AVX, AVX2 and AVX512F by including matmul_internal.m4
         multiple times.
         * generated/matmul_c10.c: Regenerated.
         * generated/matmul_c16.c: Regenerated.
         * generated/matmul_c4.c: Regenerated.
         * generated/matmul_c8.c: Regenerated.
         * generated/matmul_i1.c: Regenerated.
         * generated/matmul_i16.c: Regenerated.
         * generated/matmul_i2.c: Regenerated.
         * generated/matmul_i4.c: Regenerated.
         * generated/matmul_i8.c: Regenerated.
         * generated/matmul_r10.c: Regenerated.
         * generated/matmul_r16.c: Regenerated.
         * generated/matmul_r4.c: Regenerated.
         * generated/matmul_r8.c: Regenerated.
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