[lldb][test] Skip global module cache on Arm/AArch64 Linux (again)

This reverts commit 01c4ecb,
d14d521 and
a756dc4.

This removes the logging and workaround I added earlier,
and puts back the skip for Arm/AArch64 Linux.

I've not seen it fail on AArch64 since, but let's not create
more noise if it does.

I've written up the issue as llvm#76057.
It's something to do with trying to destroy a process while
a thread is doing a single sep. So my workaround wouldn't have
worked in any case. It needs a more involved fix.

Author: DavidSpickett

lldb/source/Target/Thread.cpp

@@ -883,18 +883,6 @@ bool Thread::ShouldStop(Event *event_ptr) {
           // If a Controlling Plan wants to stop, we let it. Otherwise, see if
           // the plan's parent wants to stop.
 
-          // Temporary logging to figure out a crash on Arm/AArch64 Linux.
-          {
-            LLDB_LOGF(log, "^^^^^^^^ Thread::ShouldStop plan stack before "
-                           "PopPlan ^^^^^^^^");
-            StreamString s;
-            s.IndentMore();
-            GetProcess()->DumpThreadPlansForTID(
-                s, GetID(), eDescriptionLevelVerbose, true /* internal */,
-                false /* condense_trivial */, true /* skip_unreported */);
-            LLDB_LOG(log, s.GetData());
-          }
-
           PopPlan();
           if (should_stop && current_plan->IsControllingPlan() &&
               !current_plan->OkayToDiscard()) {

lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py

@@ -34,6 +34,10 @@ def copy_to_main(self, src, dst):
     # The rerun tests indicate rerunning on Windows doesn't really work, so
     # this one won't either.
     @skipIfWindows
+    # On Arm and AArch64 Linux, this test attempts to pop a thread plan when
+    # we only have the base plan remaining. Skip it until we can figure out
+    # the bug this is exposing (https://github.com/llvm/llvm-project/issues/76057).
+    @skipIf(oslist=["linux"], archs=["arm", "aarch64"])
     def test_OneTargetOneDebugger(self):
         self.do_test(True, True)
 
@@ -50,11 +54,6 @@ def test_OneTargetTwoDebuggers(self):
         self.do_test(True, False)
 
     def do_test(self, one_target, one_debugger):
-        # Here to debug flakiness on Arm, remove later!
-        log_cmd_result = lldb.SBCommandReturnObject()
-        interp = self.dbg.GetCommandInterpreter()
-        interp.HandleCommand("log enable lldb step", log_cmd_result)
-
         # Make sure that if we have one target, and we run, then
         # change the binary and rerun, the binary (and any .o files
         # if using dwarf in .o file debugging) get removed from the