perf annotate: Allow configuring the 'disassembler_style' knob via 'perf config'

perf annotate: Allow configuring the 'disassembler_style' knob via 'perf config'

  # perf annotate --stdio2 acpi_processor_ffh_cstate_enter > default
  # perf config annotate.disassembler_style=intel
  # perf config annotate.disassembler_style
  annotate.disassembler_style=intel
  # perf annotate --stdio2 acpi_processor_ffh_cstate_enter > intel
  # diff -u default intel
  --- default	2020-09-04 13:09:26.019205732 -0300
  +++ intel	2020-09-04 13:09:52.823795081 -0300
  @@ -1,42 +1,42 @@
   Samples: 1K of event 'cycles', 4000 Hz, Event count (approx.): 990065316, [percent: local period]
   acpi_processor_ffh_cstate_enter() /lib/modules/5.9.0-rc3/build/vmlinux
  -Percent     → callq   __fentry__
  -              mov     cpu_number,%edx
  -              mov     %edx,%edx
  -              mov     cpu_cstate_entry,%rax
  -              add     -0x7dbe9700(,%rdx,8),%rax
  -              movzbl  0x9(%rdi),%edx
  -              mov     0x4(%rax,%rdx,8),%edi
  -              mov     (%rax,%rdx,8),%esi
  -            → jmpq    137ccc6
  -        2d: → jmpq    137ccd8
  +Percent     → call    __fentry__
  +              mov     edx,DWORD PTR gs:[rip+0x7e541d74]
  +              mov     edx,edx
  +              mov     rax,QWORD PTR [rip+0x152b8fb]
  +              add     rax,QWORD PTR [rdx*8-0x7dbe9700]
  +              movzx   edx,BYTE PTR [rdi+0x9]
  +              mov     edi,DWORD PTR [rax+rdx*8+0x4]
  +              mov     esi,DWORD PTR [rax+rdx*8]
  +            → jmp     137ccc6
  +        2d: → jmp     137ccd8
                 mfence
  -              mov     %gs:0x17bc0,%rax
  -              clflush (%rax)
  +              mov     rax,QWORD PTR gs:0x17bc0
  +              clflush BYTE PTR [rax]
                 mfence
  -              xor     %edx,%edx
  -              mov     %rdx,%rcx
  -              mov     %gs:0x17bc0,%rax
  -  0.00        monitor %rax,%ecx,%edx
  -              mov     (%rax),%rax
  -              test    $0x8,%al
  +              xor     edx,edx
  +              mov     rcx,rdx
  +              mov     rax,QWORD PTR gs:0x17bc0
  +  0.00        monitor
  +              mov     rax,QWORD PTR [rax]
  +              test    al,0x8
               ↓ jne     71
  -            ↓ jmpq    68
  -              verw    0x538b08(%rip)        # ffffffff82008150 <ds.0>
  -        68:   mov     %rsi,%rax
  -              mov     %rdi,%rcx
  -100.00        mwait   %eax,%ecx
  -        71:   mov     %gs:0x17bc0,%rax
  -              lock    andb    $0xdf,0x2(%rax)
  -              lock    addl    $0x0,-0x4(%rsp)
  -              mov     (%rax),%rax
  -              test    $0x8,%al
  +            ↓ jmp     68
  +              verw    WORD PTR [rip+0x538b08]        # ffffffff82008150 <ds.0>
  +        68:   mov     rax,rsi
  +              mov     rcx,rdi
  +100.00        mwait
  +        71:   mov     rax,QWORD PTR gs:0x17bc0
  +              lock    and     BYTE PTR [rax+0x2],0xdf
  +              lock    add     DWORD PTR [rsp-0x4],0x0
  +              mov     rax,QWORD PTR [rax]
  +              test    al,0x8
               ↓ je      97
  -              andl    $0x7fffffff,__preempt_count
  -        97: ← retq
  -              mov     %gs:0x17bc0,%rax
  -              lock    orb     $0x20,0x2(%rax)
  -              mov     (%rax),%rax
  -              test    $0x8,%al
  +              and     DWORD PTR gs:[rip+0x7e548509],0x7fffffff
  +        97:   ret
  +              mov     rax,QWORD PTR gs:0x17bc0
  +              lock    or      BYTE PTR [rax+0x2],0x20
  +              mov     rax,QWORD PTR [rax]
  +              test    al,0x8
               ↑ jne     71
  -            ↑ jmpq    2d
  +            ↑ jmp     2d
  #

Requested-by: Matt P. Dziubinski <matdzb@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>