[CP] Add missing promotion of Finalizer external size.

[rmacnak-google]

Commit(s) to merge

f4b34ad

Target

stable

Prepared changelist for beta/stable

https://dart-review.googlesource.com/c/sdk/+/289941

Issue Description

False OutOfMemory exceptions due to a VM accounting bug.

What is the fix

Properly promote external size.

Why cherry-pick

Users have encountered this issue on stable #50537 (comment) and there is no way from the Dart program to work around this.

Risk

medium

Issue link(s)

#50537

Extra Info

No response

[itsjustkevin]

@alexmarkov could you take a look at this cherry-pick for approval?

[alexmarkov]

lgtm

[xunreal75]

Does not fix out of Memory issue - Context and _Closure are growing.