[tools] Make gcmole less verbose by default

Don't print command line invocations by default.

Change-Id: Ie67c883c92557a645fc8a681722f49a2c7c4bd17
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3468901Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79130}

tools/gcmole/gcmole.py

@@ -529,7 +529,7 @@ def main(args):
       #:n't use parallel python runner.
       "sequential": False,
       # Print commands to console before executing them.
-      "verbose": True,
+      "verbose": False,
       # Perform dead variable analysis.
       "dead_vars": True,
       # Enable verbose tracing from the plugin itself.