56236fb58e
It seems our `compile` fuzz target for ISLE has not been regularly tested, as it was never updated for the `isle` -> `cranelift_isle` crate renaming. This PR fixes it to compile again. This also includes a simple fix in the typechecking: when verifying that a term decl is valid, we might insert a term ID into the name->ID map before fully checking that all of the types exist, and then skipping (for error recovery purposes) the actual push onto the term-signature vector if one of the types does have an error. This phantom TID can later cause a panic. The fix is to avoid adding to the map until we have fully verified the term decl.
ISLE Fuzz Targets
These are separate from the top-level wasmtime/fuzz fuzz targets because we
don't intend to run them on OSS-Fuzz. They are just for local ISLE hacking.