[tools] Print CWD change in debug log

Change-Id: Ibb8de6e2df6eaee5413d9d6b197a9490dfa8ff07
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3172756Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76963}

tools/run_perf.py

@@ -459,7 +459,9 @@ class RunnableConfig(GraphConfig):
     """
     suite_dir = os.path.abspath(os.path.dirname(suite_path))
     bench_dir = os.path.normpath(os.path.join(*self.path))
-    os.chdir(os.path.join(suite_dir, bench_dir))
+    cwd = os.path.join(suite_dir, bench_dir)
+    logging.debug('Changing CWD to: %s' % cwd)
+    os.chdir(cwd)
 
   def GetCommandFlags(self, extra_flags=None):
     suffix = ['--'] + self.test_flags if self.test_flags else []