ROR the callable_convert_cache key for better hash distribution (#20052)

Author: ndossche

Zend/zend_vm_def.h

@@ -9720,7 +9720,11 @@ ZEND_VM_HANDLER(202, ZEND_CALLABLE_CONVERT, UNUSED, UNUSED, NUM|CACHE_SLOT)
 		if (closure) {
 			ZVAL_OBJ_COPY(EX_VAR(opline->result.var), closure);
 		} else {
-			zval *closure_zv = zend_hash_index_lookup(&EG(callable_convert_cache), (zend_ulong)(uintptr_t)call->func);
+			/* Rotate the key for better hash distribution. */
+			const int shift = sizeof(size_t) == 4 ? 6 : 7;
+			zend_ulong key = (zend_ulong)(uintptr_t)call->func;
+			key = (key >> shift) | (key << ((sizeof(key) * 8) - shift));
+			zval *closure_zv = zend_hash_index_lookup(&EG(callable_convert_cache), key);
 			if (Z_TYPE_P(closure_zv) == IS_NULL) {
 				zend_closure_from_frame(closure_zv, call);
 			}