chore: update test case

Author: Wybxc

tests/codegen/params_count.rs

@@ -13,7 +13,7 @@ extern crate mini_core;
 
 // expect three int params
 // CHECK-LABEL: foo
-// CHECK: (int32_t {{[a-zA-Z_][a-zA-Z0-9_]*}}, int32_t {{[a-zA-Z_][a-zA-Z0-9_]*}}, int32_t {{[a-zA-Z_][a-zA-Z0-9_]*}})
+// CHECK: (int32_t {{[[:alnum:]_]*}}, int32_t {{[[:alnum:]_]*}}, int32_t {{[[:alnum:]_]*}})
 // CHECK: return 0;
 #[no_mangle]
 pub fn foo(_x: i32, _y: i32, _z: i32) -> i32 {