add the `const_evaluatable_checked` feature Implements a rather small subset of https://github.com/rust-lang/compiler-team/issues/340 Unlike the MCP, this does not try to compare different constant, but instead only adds the constants found in where clauses to the predicates of a function. This PR adds the feature gate `const_evaluatable_checked`, without which nothing should change. r? @oli-obk @eddyb
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