Fix empty TypedArray creation

[kateinoigakukun]

Close swiftwasm/swift#5599

Empty array instances share the same storage for all element types, so their baseAddress can be unaligned. (It seems the empty array storage had been placed at 8-aligned position fortunately but it's no longer the case since Swift 6.0, I guess)

https://github.com/swiftlang/swift/blob/2914d0e46eda33cadfd81c3381e8737855ce397c/stdlib/public/stubs/GlobalObjects.cpp#L42

[github-actions]

Time Change: +260ms (2%)

Total Time: 9,837ms

Test name	Duration	Change
Serialization/JavaScript function call from Swift	116ms	+9ms (7%)	🔍
Serialization/Swift Int to JavaScript with assignment	354ms	+32ms (9%)	🔍
Serialization/JavaScript Number to Swift Int	317ms	+17ms (5%)	🔍
Serialization/Swift String to JavaScript with assignment	393ms	+20ms (5%)	🔍

View Unchanged

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	20ms	-1ms
Serialization/JavaScript function call through Wasm import with int	14ms	-0ms
Serialization/Swift Int to JavaScript with call	1,071ms	+51ms (4%)
Serialization/Swift String to JavaScript with call	1,118ms	+39ms (3%)
Serialization/JavaScript String to Swift String	3,775ms	+109ms (2%)
Object heap/Increment and decrement RC	2,647ms	-16ms (0%)

View Baselines

Test name	Duration
Serialization/Call JavaScript function directly	3ms
Serialization/Assign JavaScript number directly	3ms
Serialization/Call with JavaScript number directly	3ms
Serialization/Write JavaScript string directly	2ms
Serialization/Call with JavaScript string directly	2ms

[ephemer]

Thank you for this change!