Don't pretend INTERP-INFO atomic dir handling is general.

The INTERP-INFO atomic dir case is special since it contains just one
file. Safe deletion in the general atomic dir case requires
reader-writer file locks.

Author: jsirois

pex/cache/dirs.py

@@ -8,7 +8,6 @@
 import hashlib
 import os
 
-from pex.atomic_directory import atomic_directory
 from pex.common import pluralize, safe_rmtree
 from pex.compatibility import safe_commonpath, string
 from pex.enum import Enum
@@ -281,11 +280,6 @@ def __init__(
         # type: (...) -> None
         self.path = path
 
-    def safe_delete(self):
-        with atomic_directory(self.path) as atomic_dir:
-            if atomic_dir.is_finalized():
-                safe_rmtree(self.path)
-
     def __repr__(self):
         # type: () -> str
         return "{clazz}(path={path})".format(clazz=self.__class__.__name__, path=self.path)

pex/interpreter.py

@@ -1119,7 +1119,7 @@ def create_interpreter(
 
         cache_dir = InterpreterDir.create(binary)
         if ignore_cached:
-            cache_dir.safe_delete()
+            safe_rmtree(cache_dir)
         if os.path.isfile(cache_dir.interp_info_file):
             try:
                 with open(cache_dir.interp_info_file, "rb") as fp: