[emcc.py] Remove main wrapper. NFC (emscripten-core#25700)

We have the toolchain profiler (EMPROFILE=2) so we don't need to inject
our own timing here.

Author: sbc100

emcc.py

@@ -26,7 +26,6 @@
 import shutil
 import sys
 import tarfile
-import time
 from dataclasses import dataclass
 from enum import Enum, auto, unique
 
@@ -171,10 +170,8 @@ def make_relative(filename):
       reproduce_file.add(rsp_name, os.path.join(root, 'response.txt'))
 
 
-#
-# Main run() function
-#
-def run(args):
+@ToolchainProfiler.profile()
+def main(args):
   if shared.run_via_emxx:
     clang = shared.CLANG_CXX
   else:
@@ -591,14 +588,6 @@ def compile_source_file(input_file):
   return [f.value for f in linker_args]
 
 
-@ToolchainProfiler.profile()
-def main(args):
-  start_time = time.time()
-  ret = run(args)
-  logger.debug('total time: %.2f seconds', (time.time() - start_time))
-  return ret
-
-
 if __name__ == '__main__':
   try:
     sys.exit(main(sys.argv))