[scudo] Drain caches when release with M_PURGE_ALL

This will drain both quarantine and local caches.

Reviewed By: cferris

Differential Revision: https://reviews.llvm.org/D150242

Bug: 281740882

GitOrigin-RevId: 6a057e7b51beaa54ebaece825ba1c87db0a7322d
Change-Id: I6d32d5358aa466d363e7bfe222cd178747df827c
Merged-In: I6d32d5358aa466d363e7bfe222cd178747df827c
(cherry picked from commit 203a35abcedb273f6ee1955f5d007913ae8bdf9a)