Update update_v8_wasm_profile.py

update to python3

tools/update_v8_wasm_profile.py

@@ -22,7 +22,7 @@ def main(cpuprofile_file, symbol_file):
     all_md5s = []
     with open(cpuprofile_file) as f:
         profile_text = f.read()
-        for k, v in symbol_map.iteritems():
+        for k, v in symbol_map.items():
             count += 1
             strip_name = []
             for p in v.split('_'):
@@ -54,4 +54,4 @@ if __name__ == '__main__':
     if len(sys.argv) != 3:
         print('usage: python update_v8_wasm_profile.py xxx.cpuprofile xxx.symbols')
     else:
-        main(sys.argv[1], sys.argv[2])
\ No newline at end of file
+        main(sys.argv[1], sys.argv[2])