Perform tuning later, it seems slightly faster

Author: JukkaL

mypy/__main__.py

@@ -2,11 +2,6 @@
 
 from __future__ import annotations
 
-from mypy.gctune import tune_gc
-
-# Tune GC as early as possible, before most imports
-tune_gc()
-
 import os
 import sys
 import traceback

mypyc/__main__.py

@@ -12,11 +12,6 @@
 
 from __future__ import annotations
 
-from mypy.gctune import tune_gc
-
-# Tune GC as early as possible, before most imports
-tune_gc()
-
 import os
 import os.path
 import subprocess