4.5.0

Work around a Linux kernel bug induced by DirtyCOW fix.
Support for Hardware Lock Elision, with detection of a KVM PMU virtualization bug that breaks HLE support.
Make syscall-buffering use an alternate stack (makes Go programs work).
Syscall support expanded (especially ptrace subcalls).
Support for Knights Landing and Kaby Lake CPUs.
Many bugs fixed.
Great thanks to Keno Fischer for much of this work!