Merge 4.4.142 into kernel.lnx.4.4.r27-rel

Changes in 4.4.142: (4 commits)
        Kbuild: fix # escaping in .cmd files for future Make
        x86/cpu: Probe CPUID leaf 6 even when cpuid_level == 6
        perf tools: Move syscall number fallbacks from perf-sys.h to tools/arch/x86/include/asm/
        Linux 4.4.142

Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>