Add option to write specialization stats to files and script to summarize. (GH-27575)

* Add option to write stats to random file in a directory.

* Add script to summarize stats.

Tools/scripts/summarize_specialization_stats.py

@@ -0,0 +1,41 @@
+"""Print a summary of specialization stats for all files in the
+default stats folders.
+"""
+
+import collections
+import os.path
+
+if os.name == "nt":
+    DEFAULT_DIR = "c:\\temp\\py_stats\\"
+else:
+    DEFAULT_DIR = "/tmp/py_stats/"
+
+
+TOTAL = "deferred", "hit", "miss", "unquickened"
+
+def print_stats(name, family_stats):
+    total = sum(family_stats[kind] for kind in TOTAL)
+    if total == 0:
+        return
+    print(name+":")
+    for key in sorted(family_stats):
+        if not key.startswith("specialization"):
+            print(f"{key:>12}:{family_stats[key]:>12} {100*family_stats[key]/total:0.1f}%")
+    for key in ("specialization_success",  "specialization_failure"):
+        print(f"  {key}:{family_stats[key]:>12}")
+
+def main():
+    stats = collections.defaultdict(collections.Counter)
+    for filename in os.listdir(DEFAULT_DIR):
+        for line in open(os.path.join(DEFAULT_DIR, filename)):
+            key, value = line.split(":")
+            key = key.strip()
+            family, stat = key.split(".")
+            value = int(value.strip())
+            stats[family][stat] += value
+
+    for name in sorted(stats):
+        print_stats(name, stats[name])
+
+if __name__ == "__main__":
+    main()