[binutils-gdb] x86: CpuXSAVE is a prereq for various other features

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 59ef5df41e8a2addac4c74bb838fe8295cc79ebf ***

Author: Jan Beulich <jbeulich@novell.com>
Branch: master
Commit: 59ef5df41e8a2addac4c74bb838fe8295cc79ebf

x86: CpuXSAVE is a prereq for various other features

All of AVX, LWP, MPX, and PKU require XSAVE, and hence it as well as
XRSTOR should be enabled when enabling these ISA extensions. Leverage
these implications to shorten some of the cpu_flag_init[] entries.