Expose WebWorkerTaskExecutor even if compiling with toolchain < 6.1

[kateinoigakukun]

No description provided.

[github-actions]

Time Change: +5ms (0%)

Total Time: 9,575ms

View Unchanged

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	20ms	+0ms
Serialization/JavaScript function call through Wasm import with int	13ms	-0ms
Serialization/JavaScript function call from Swift	108ms	+1ms (0%)
Serialization/Swift Int to JavaScript with assignment	333ms	+5ms (1%)
Serialization/Swift Int to JavaScript with call	1,022ms	+5ms (0%)
Serialization/JavaScript Number to Swift Int	294ms	+4ms (1%)
Serialization/Swift String to JavaScript with assignment	387ms	-2ms (0%)
Serialization/Swift String to JavaScript with call	1,079ms	+1ms (0%)
Serialization/JavaScript String to Swift String	3,629ms	-2ms (0%)
Object heap/Increment and decrement RC	2,675ms	-9ms (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	3ms
Serialization/Call with JavaScript string directly	3ms