adxintrin.h: Remove guarding __ADX__ check.

adxintrin.h: Remove guarding __ADX__ check.

Changelog
        * config/i386/adxintrin.h: Remove guarding __ADX__ check.
        * config/i386/x86intrin.h: Likewise.
        * config/i386/i386.c (ix86_init_mmx_sse_builtins): Remove
        OPTION_MASK_ISA_ADX from needed options for
        __builtin_ia32_addcarryx_u32 and __builtin_ia32_addcarryx_u64.
        (ix86_expand_builtin): Use add<mode>3_carry in expanding of
        IX86_BUILTIN_ADDCARRYX32 and IX86_BUILTIN_ADDCARRYX64.

testsuite/Changelog
        * gcc.target/i386/adx-addxcarry32-3.c: New.
        * gcc.target/i386/adx-addxcarry64-3.c: New.

From-SVN: r190254