Use a human-readable funcname with --jit-debug

for perf output like:

Samples: 100K of event 'cycles:ppp', Event count (approx.): 1007750000
  Children      Self  Command  Shared Object             Symbol
+   81.58%     1.47%  ruby     ruby                      [.] rb_vm_exec
+   81.06%     7.61%  ruby     ruby                      [.] vm_exec_core
+   80.16%     0.00%  ruby     ruby                      [.] vm_sendish (inlined)
+   75.03%     0.00%  ruby     ruby                      [.] mjit_exec (inlined)
+   74.37%     0.00%  ruby     ruby                      [.] mjit_exec (inlined)
+   73.42%     0.22%  ruby     _ruby_mjit_p11277u42.so   [.] _mjit42_rack_method_override_rb_call
+   73.25%     0.10%  ruby     _ruby_mjit_p11277u41.so   [.] _mjit41_sinatra_show_exceptions_rb_call
+   73.19%     0.22%  ruby     _ruby_mjit_p11277u44.so   [.] _mjit44_rack_head_rb_call
+   73.03%     0.15%  ruby     _ruby_mjit_p11277u45.so   [.] _mjit45_sinatra_base_rb_call
+   72.87%     0.26%  ruby     _ruby_mjit_p11277u49.so   [.] _mjit49_rack_logger_rb_call
+   70.56%     0.11%  ruby     _ruby_mjit_p11277u40.so   [.] _mjit40_sinatra_base_rb_call
+   68.70%     0.11%  ruby     _ruby_mjit_p11277u39.so   [.] _mjit39_sinatra_base_rb_call
+   68.39%     0.29%  ruby     _ruby_mjit_p11277u56.so   [.] _mjit56_rack_protection_frame_options_rb_call
+   67.89%     0.18%  ruby     _ruby_mjit_p11277u37.so   [.] _mjit37_sinatra_base_rb_block_in_call
+   67.04%     0.16%  ruby     _ruby_mjit_p11277u34.so   [.] _mjit34_sinatra_base_rb_synchronize

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