Correctly port realloc from 1.9 to 1.10 (#52929)

I think when we backed off the new heuristics for 1.10 this got missed
in the meanwhile.
Should fix #52923

Author: gbaraldi

src/gc.c

@@ -3729,7 +3729,10 @@ JL_DLLEXPORT void *jl_gc_counted_realloc_with_old_size(void *p, size_t old, size
     if (data != NULL && pgcstack != NULL && ct->world_age) {
         jl_ptls_t ptls = ct->ptls;
         maybe_collect(ptls);
-        if (!(sz < old))
+        if (sz < old)
+            jl_atomic_store_relaxed(&ptls->gc_num.freed,
+                jl_atomic_load_relaxed(&ptls->gc_num.freed) + (old - sz));
+        else
             jl_atomic_store_relaxed(&ptls->gc_num.allocd,
                 jl_atomic_load_relaxed(&ptls->gc_num.allocd) + (sz - old));
         jl_atomic_store_relaxed(&ptls->gc_num.realloc,
@@ -3856,7 +3859,10 @@ static void *gc_managed_realloc_(jl_ptls_t ptls, void *d, size_t sz, size_t olds
         ptls->gc_cache.perm_scanned_bytes += allocsz - oldsz;
         inc_live_bytes(allocsz - oldsz);
     }
-    else if (!(allocsz < oldsz))
+    else if (allocsz < oldsz)
+        jl_atomic_store_relaxed(&ptls->gc_num.freed,
+            jl_atomic_load_relaxed(&ptls->gc_num.freed) + (oldsz - allocsz));
+    else
         jl_atomic_store_relaxed(&ptls->gc_num.allocd,
             jl_atomic_load_relaxed(&ptls->gc_num.allocd) + (allocsz - oldsz));
     jl_atomic_store_relaxed(&ptls->gc_num.realloc,