Erik Eckstein 2d88482c9f EscapeUtils: add a computational limit to avoid quadratic complexity in some corner cases. ...

The `isEscaping` function is called a lot from ARCSequenceOpt and ReleaseHoisting.
To avoid quadratic complexity for large functions, limit the amount of work what the EscapeUtils are allowed to to.
This keeps the complexity linear.

The arbitrary limit is good enough for almost all functions.
It lets the EscapeUtils do several hundred up/down walks which is much more than needed in most cases.

Fixes a compiler hang
https://github.com/apple/swift/issues/63846
rdar://105795976

2023-02-24 18:58:01 +01:00

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