Merge pull request #2941 from apple/cherry-pick-d319005a3746a7661c8c9a3302266b6ff7cf61be

lit: revert 134b103

Author: shahmishal

llvm/utils/lit/lit/util.py

@@ -119,12 +119,6 @@ def usable_core_count():
         n = len(os.sched_getaffinity(0))
     except AttributeError:
         n = os.cpu_count() or 1
-
-    # On Windows, with more than 32 processes, process creation often fails with
-    # "Too many open files".  FIXME: Check if there's a better fix.
-    if platform.system() == 'Windows':
-        return min(n, 32)
-
     return n