Don't treat expression exit as terminator

Same as with throw expressions, this may remove later temporary
consuming instructions and thus eliminate live ranges, resulting
in a memory

Don't treat expression exit as terminator

Same as with throw expressions, this may remove later temporary
consuming instructions and thus eliminate live ranges, resulting
in a memory leak. We make use of the same hack and don't consider
exit a terminator if used in an expression context.

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Avoid throw expression leaks

Mark "throw" used in expression context with a flag, and don't
treat it as a BB terminator in that case. This prevents us from
optimizing away the follow

Avoid throw expression leaks

Mark "throw" used in expression context with a flag, and don't
treat it as a BB terminator in that case. This prevents us from
optimizing away the following opcodes as unreachable, which may
result in live ranges being dropped incorrectly.

Close GH-5450.

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