Revert "Attempt to fix #22628 by killing all stdtests"

This reverts commit 9911005.

Author: brson

master/master.cfg

@@ -909,16 +909,6 @@ def make_and_check_buildfactory(check, android, windows, parallel):
                       workdir=BUILD_WORKDIR,
                       command=[MakeCommand(), "clean-llvm"]))
 
-    if windows:
-        taskkill_cmd = ["taskkill", "/T", "/F", "/FI", "IMAGENAME eq stdtest*"]
-        # FIXME https://github.com/rust-lang/rust/issues/22628
-        # Windows test hangs cause lots of problems. This tries
-        # to kill stdtest.
-        f.addStep(ShellCommand(env=CommandEnv(),
-                               name="taskkill hack",
-                               command=taskkill_cmd,
-                               workdir=WORKDIR))
-
     # msys make is pretty buggy with paralellization
     if windows or not parallel:
         command = [MakeCommand()]