[Interpreter] Support Linux perf >= 4.1 in linux_perf_report.py.

tools/ignition/linux_perf_report.py

 #! /usr/bin/python2
 #
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 
 import argparse
 import collections
 import re
@@ skipping 79 matching lines @@
         yield current_chain
       # Reset parser status.
       current_chain = []
       skip_until_end_of_chain = False
       compiler_symbol_in_chain = False
       continue
 
     if skip_until_end_of_chain:
       continue
 
-    symbol = line.split(" ", 1)[1]
+    # Trim the leading address and the trailing +offset, if present.
+    symbol = line.split(" ", 1)[1].split("+", 1)[0]
     if not show_full_signatures:
       symbol = strip_function_parameters(symbol)
     current_chain.append(symbol)
 
     if symbol.startswith("BytecodeHandler:"):
       yield current_chain
       skip_until_end_of_chain = True
     elif symbol == "Stub:CEntryStub" and compiler_symbol_in_chain:
       if show_all:
         current_chain[-1] = "[compiler]"
@@ skipping 86 matching lines @@
     metavar="<output filename>",
     dest="output_stream"
   )
 
   return command_line_parser.parse_args()
 
 
 def main():
   program_options = parse_command_line()
 
-  perf = subprocess.Popen(["perf", "script", "-f", "ip,sym",
+  perf = subprocess.Popen(["perf", "script", "--fields", "ip,sym",
                            "-i", program_options.perf_filename],
                           stdout=subprocess.PIPE)
 
   callchains = collapsed_callchains_generator(
     perf.stdout, program_options.show_all,
     program_options.show_full_signatures)
 
   if program_options.output_flamegraph:
     write_flamegraph_input_file(program_options.output_stream, callchains)
   else:
     write_handlers_report(program_options.output_stream, callchains)
 
 
 if __name__ == "__main__":
   main()