[lldb] Make IR interpreter timeout test more loose

This has failed once in a while on our Windows on Arm bot:
https://lab.llvm.org/buildbot/#/builders/219/builds/4688

Traceback (most recent call last):
  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\...
    self.assertGreaterEqual(duration_sec, 1)
AssertionError: 0.9907491207122803 not greater than or equal to 1

We're not here to check that Python/the C++ lib/the OS implemented
timers correctly, so accept anything 0.95 or greater.

Author: DavidSpickett

lldb/test/API/commands/expression/ir-interpreter/TestIRInterpreter.py

@@ -44,7 +44,8 @@ def test_interpreter_timeout(self):
         options.SetTimeoutInMicroSeconds(1000000)
         res, duration_sec = self.time_expression(inf_loop, options)
         self.assertIn(timeout_error, str(res.GetError()))
-        self.assertGreaterEqual(duration_sec, 1)
+        # Anything within 5% of 1s is fine, to account for machine differences.
+        self.assertGreaterEqual(duration_sec, 0.95)
         self.assertLess(duration_sec, 30)
 
     def test_interpreter_interrupt(self):