JIT: Enable inlining for late devirtualization

[hez2010]

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[hez2010]

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[hez2010]

This needs to be done in another way.
Ideally, instead of doing inlining in a morph phase at once, we should turn the inliner into a separate component that can be called during the whole import phase so that we can inline a method at any time.

I'm going to start the prototype for this.