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Auto merge of #91742 - cjgillot:force-backtrace, r=estebank

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Print a backtrace when query forcing fails.

The aim of this PR is to help debugging incremental compilation bugs where query forcing panics.
For instance: https://github.com/rust-lang/rust/issues/90682 https://github.com/rust-lang/rust/issues/90697 https://github.com/rust-lang/rust/issues/90715 https://github.com/rust-lang/rust/issues/90739 https://github.com/rust-lang/rust/issues/91401

These bugs happen when the dep-graph attempts to force a dep-node whose fingerprint does not correspond to an actual DefPathHash. PR https://github.com/rust-lang/rust/pull/91741 attempts to hide this bug.

I still don't know how to reproduce these bugs, so I sadly could not test this debugging device.
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bors 2023-02-24 23:48:44 +00:00
commit 80b4b33c86
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