std.ArrayHashMap: base linear_scan_max on cache line size

Author: andrewrk

lib/std/array_hash_map.zig

@@ -605,7 +605,11 @@ pub fn ArrayHashMapUnmanaged(
 
         const Self = @This();
 
-        const linear_scan_max = 8;
+        const linear_scan_max = @max(1, @min(
+            std.atomic.cache_line / @sizeOf(Hash),
+            std.atomic.cache_line / @sizeOf(K),
+            std.atomic.cache_line / @sizeOf(V),
+        ));
 
         const RemovalType = enum {
             swap,