[scudo] Update secondary cache released pages bound. (#106466)

`MaxReleasedCachePages` has been set to 4. Initially, in #105009 , we
set `MaxReleasedCachePages` to 0 so that the partial chunk heuristic
could be introduced incrementally as we observed its impact on retrieval
order and more generally, performance.

Co-authored-by: Joshua Baehring <[email protected]>

Author: JoshuaMBa

compiler-rt/lib/scudo/standalone/secondary.h

@@ -79,8 +79,7 @@ struct CachedBlock {
   //        it suggests that beyond 4 pages, the release execution time is
   //        longer than the map execution time. In this way, the default
   //        is dependent on the platform.
-  //    TODO: set MaxReleasedCachePages back to 4U
-  static constexpr uptr MaxReleasedCachePages = 0U;
+  static constexpr uptr MaxReleasedCachePages = 4U;
 
   uptr CommitBase = 0;
   uptr CommitSize = 0;