perf-core-2021-10-31

 core:

  - Allow ftrace to instrument parts of the perf core code

  - Add a new mem_hops field to perf_mem_data_src which allows to represent
    intra-node/package or inter-node/off-package details to prepare for
    next generation systems which have more hieararchy within the
    node/pacakge level.

 tools:

  - Update for the new mem_hops field in perf_mem_data_src

 arch:

  - A set of constraints fixes for the Intel uncore PMU

  - The usual set of small fixes and improvements for x86 and PPC