perf annotate stdio2: Print more descriptive event information header

To match the recently added event header information to --tui, e.g.:

  # perf annotate --ignore-vmlinux --stdio2 _raw_spin_lock_irqsave
  Samples: 128  of event 'cycles:ppp', 4000 Hz, Event count (approx.): 48617682
  _raw_spin_lock_irqsave() /proc/kcore
    0.78        nop
    7.03        push   %rbx
    3.12        pushfq
    6.25        pop    %rax
                nop
                mov    %rax,%rbx
    3.12        cli
                nop
                xor    %eax,%eax
                mov    $0x1,%edx
   79.69        lock   cmpxchg %edx,(%rdi)
                test   %eax,%eax
              ↓ jne    2b
                mov    %rbx,%rax
                pop    %rbx
              ← retq
          2b:   mov    %eax,%esi
              → callq  *ffffffffb30eaed0
                mov    %rbx,%rax
                pop    %rbx
              ← retq
  #

Cc: Adrian Hunter <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Martin Liška <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Wang Nan <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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