Function mitigate_x86_ssb_bug 

pub fn mitigate_x86_ssb_bug(
    cpuid: &impl Cpuid,
    speculation: &impl RwSafeReg<SpeculationControlMsr>,
    virtual_speculation: &impl RwSafeReg<VirtualSpeculationControlMsr>,
    load_store_configuration: &impl RwSafeReg<AmdLoadStoreConfigurationMsr>,
) -> bool

Attempt to mitigate the SSB bug. Return true if the bug was successfully mitigated.