Probes updates for v6.9:

 - x96/kprobes: Use boolean for some function return instead of 0 and 1.
 - x86/kprobes: Prohibit probing on INT/UD. This prevents user to put kprobe on
    INTn/INT1/INT3/INTO and UD0/UD1/UD2 because these are used for a special
    purpose in the kernel.
 - x86/kprobes: Boost Grp instructions. Because a few percent of kernel
    instructions are Grp 2/3/4/5 and those are safe to be executed without
    ip register fixup, allow those to be boosted (direct execution on the
    trampoline buffer with a JMP).

 - tracing/probes: Add function argument access from return events (kretprobe
    and fprobe). This allows user to compare how a data structure field is
    changed after executing a function. With BTF, return event also accepts
    function argument access by name. This also includes below patches;
  . Fix a wrong comment (using "Kretprobe" in fprobe)
  . Cleanup a big probe argument parser function into three parts, type
     parser, post-processing function, and main parser.
  . Cleanup to set nr_args field when initializing trace_probe instead of
     counting up it while parsing.
  . Cleanup a redundant #else block from tracefs/README source code.
  . Update selftests to check entry argument access from return probes.
  . Documentation update about entry argument access from return probes.
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