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Currently there is an interesting situation with the way features get enabled; `testcrate` enables `mangled-names`, but the `intrinsics.rs` example requires this feature be disabled (otherwise the test fails with missing symbols, as expected). This is also the reason that `testcrate` is not a default workspace member, meaning `cargo test` doesn't actually run `testcrate`'s tests; making it a default member would mean that `compiler-builtins/mangled-names` gets enabled when `examples/intrinsics.rs` gets built, due to the way features get unified. Simplify the situation by making moving the example to its own crate as `builtins-test-intrinsics`. This also means `testcrate` can become a default member so it is included in `cargo check` or `cargo test` when run at the workspace root. `testcrate` and `builtins-test-intrinsics` still can't be built at the same time since there isn't a straightforward way to have Cargo build `compiler-builtins` twice with different features. This is a side effect of us using non-additive features, but there isn't really a better option since enabling both mangled and unmangled names would render `builtins-test-intrinsics` useless.