Snapshotted pub executables behave badly with unhandled exceptions

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="96" height="96"hspace="10"> Issue by nex3
Originally opened as dart-lang/sdk#22076

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Currently, if a snapshotted pub executable (most commonly one installed with "pub global activate") has an unhandled exception, the executable will be recompiled and re-run three times before ultimately failing. This is du to issue dart-lang/sdk#20802, which makes it impossible for the script running the executable to determine if it's up-to-date without running it, and the fact that the VM emits the same exit code for unhandled exceptions and for invalid snapshot numbers.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Thanks to dart-lang/sdk@c859d25, I now have out https://codereview.chromium.org/899373002 to fix this.

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Unmarked this as being blocked by dart-lang/sdk#20802.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Fixed in dart-lang/sdk@b97af95.

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Added Fixed label.