Migrate tools/spec_parse.py to use python3

Change-Id: I3d9b133afd56f5b40bc38a4dab4eac73d5a2341a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/195922
Commit-Queue: Erik Ernst <eernst@google.com>
Reviewed-by: Alexander Thomas <athom@google.com>

tools/spec_parse.py

@@ -14,12 +14,9 @@
 #   - the ANTLR3 jar is available as /usr/share/java/antlr4-runtime.jar.
 
 import os
-import string
 import subprocess
 import sys
 
-import utils
-
 
 def Help(missing):
     print('Execution of the spec parser failed. Missing: ' + missing)
@@ -33,18 +30,14 @@ def Main():
     spec_parser_dir = os.path.join(tools_dir, 'spec_parser')
     spec_parser_file = os.path.join(spec_parser_dir, 'SpecParser.class')
     antlr_jar = '/usr/share/java/antlr4-runtime.jar'
-    class_path = string.join([spec_parser_dir, antlr_jar], ':')
+    class_path = ':'.join([spec_parser_dir, antlr_jar])
     command = ['java', '-cp', class_path, 'SpecParser'] + args
 
     if not os.path.exists(antlr_jar): Help(antlr_jar)
     if not os.path.exists(spec_parser_file):
         Help('"make parser" in spec_parser')
 
-    with utils.CoreDumpArchiver(args):
-        exit_code = subprocess.call(command)
-
-    utils.DiagnoseExitCode(exit_code, command)
-    return exit_code
+    return subprocess.call(command)
 
 
 if __name__ == '__main__':