[AArch64] Add reference to ACLE and consolidate documentation.

[AArch64] Add reference to ACLE and consolidate documentation.

2014-11-12  Tejas Belagod  <tejas.belagod@arm.com>

        * Makefile.in (TEXI_GCC_FILES): Remove arm-acle-intrinsics.texi,
        arm-neon-intrinsics.texi, aarch64-acle-intrinsics.texi.
        * doc/aarch64-acle-intrinsics.texi: Remove.
        * doc/arm-acle-intrinsics.texi: Remove.
        * doc/arm-neon-intrinsics.texi: Remove.
        * doc/extend.texi: Consolidate sections AArch64 intrinsics,
        ARM NEON Intrinsics, ARM ACLE Intrinsics into one ARM C Language
        Extension section. Add references to public ACLE specification.

From-SVN: r217405