[heap] switch default FreeList strategy to FreeListManyCachedOrigin

This CL enables the FreeList strategy introduced by CL 1762292.

Bug: v8:9329
Change-Id: I73c1399aa9ae9a602f29f208c5543927a1405403
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1765533Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Darius Mercadier <dmercadier@google.com>
Cr-Commit-Position: refs/heads/master@{#63348}

src/flags/flag-definitions.h

@@ -828,7 +828,7 @@ DEFINE_BOOL(
     trace_allocations_origins, false,
     "Show statistics about the origins of allocations. "
     "Combine with --no-inline-new to track allocations from generated code")
-DEFINE_INT(gc_freelist_strategy, 0,
+DEFINE_INT(gc_freelist_strategy, 5,
            "Freelist strategy to use: "
            "0:FreeListLegacy. "
            "1:FreeListFastAlloc. "