Make JSObject.id getter inlinable

[kateinoigakukun]

This change makes JSObject.id getter inlinable. Those who use the API to avoid dynamic member lookup overhead can now benefit from the inlinable getter.

[github-actions]

Time Change: -51ms (0%)

Total Time: 9,559ms

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	22ms	-2ms (7%)	✅

View Unchanged

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import with int	20ms	+1ms
Serialization/JavaScript function call from Swift	123ms	-2ms (1%)
Serialization/Swift Int to JavaScript with assignment	330ms	-5ms (1%)
Serialization/Swift Int to JavaScript with call	964ms	-5ms (0%)
Serialization/JavaScript Number to Swift Int	271ms	+2ms (0%)
Serialization/Swift String to JavaScript with assignment	411ms	-0ms
Serialization/Swift String to JavaScript with call	1,034ms	-10ms (0%)
Serialization/JavaScript String to Swift String	3,592ms	-24ms (0%)
Object heap/Increment and decrement RC	2,777ms	-6ms (0%)

View Baselines

Test name	Duration
Serialization/Call JavaScript function directly	3ms
Serialization/Assign JavaScript number directly	2ms
Serialization/Call with JavaScript number directly	3ms
Serialization/Write JavaScript string directly	4ms
Serialization/Call with JavaScript string directly	3ms

[fjtrujy]

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