fix(es/compat): counteract unrolling of awaited async arrays in generator

[finnboeger]

Description:
This is a workaround addressing the issue #5951 by wrapping the arguments of the .concat call in individual arrays to counteract the unrolling done by concat.

A different way of handling the problem would be to push the arguments to _tmp before the return statement and then use _tmp in the apply call. However I'm not comfortable enough with the codebase to implement it that way.

BREAKING CHANGE:
None afaik, all tests in crates/swc complete successfully and anything that depended on the broken implementation would not have worked with a different transformer.

Related issue (if exists):

• Closes asyncToGenerator function unrolls secondary parameter if it is an array #5951.

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[kdy1]

Thanks!

[kdy1]

Thank you!

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swc-bump:

• swc_ecma_transforms_compat