Prefer `UInt(bitPattern:)` for object id to guarantee uniqueness

[kateinoigakukun]

Close https://github.com/swiftwasm/JavaScriptKit/issues/218

[github-actions[bot]]

Time Change: -141ms (0%)

Total Time: 20,533ms

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	23ms	-2ms (8%)	✅
Serialization/JavaScript function call through Wasm import with int	22ms	-1ms (6%)	✅

View Unchanged

| Test name | Duration | Change | | :--- | :---: | :---: | | Serialization/JavaScript function call from Swift | 194ms | -4ms (2%) | | Serialization/Swift Int to JavaScript with assignment | 515ms | +3ms (0%) | | Serialization/Swift Int to JavaScript with call | 1,607ms | -19ms (1%) | | Serialization/JavaScript Number to Swift Int | 529ms | -6ms (1%) | | Serialization/Swift String to JavaScript with assignment | 591ms | -6ms (1%) | | Serialization/Swift String to JavaScript with call | 1,709ms | -49ms (2%) | | Serialization/JavaScript String to Swift String | 6,334ms | -161ms (2%) | | Object heap/Increment and decrement RC | 8,987ms | +107ms (1%) |

View Baselines

| Test name | Duration | | :--- | :---: | | Serialization/Call JavaScript function directly | 4ms | | Serialization/Assign JavaScript number directly | 3ms | | Serialization/Call with JavaScript number directly | 7ms | | Serialization/Write JavaScript string directly | 4ms | | Serialization/Call with JavaScript string directly | 4ms |

[sidepelican]

Thanks!