Detect if the compiler can support the ifun and avx2, if so, set
CONFIG_AVX2_OPT which will be used to turn on the avx2 instruction
optimization.
Suggested-by: NPaolo Bonzini <pbonzini@redhat.com>
Suggested-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NLiang Li <liang.z.li@intel.com>
Message-Id: <1457416397-26671-2-git-send-email-liang.z.li@intel.com>
Signed-off-by: NAmit Shah <amit.shah@redhat.com>