Add support for a new attribute #[debugger_visualizer] to support embedding debugger visualizers into a generated PDB.

Cleanup `DebuggerVisualizerFile` type and other minor cleanup of queries.

Merge the queries for debugger visualizers into a single query.

Revert move of `resolve_path` to `rustc_builtin_macros`. Update dependencies in Cargo.toml for `rustc_passes`.

Respond to PR comments. Load visualizer files into opaque bytes `Vec<u8>`. Debugger visualizers for dynamically linked crates should not be embedded in the current crate.

Update the unstable book with the new feature. Add the tracking issue for the debugger_visualizer feature.

Respond to PR comments and minor cleanups.

compiler/rustc_feature/src/active.rs

@@ -358,6 +358,8 @@ declare_features! (
     (active, custom_inner_attributes, "1.30.0", Some(54726), None),
     /// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`.
     (active, custom_test_frameworks, "1.30.0", Some(50297), None),
+    /// Allows using `#[debugger_visualizer]`.
+    (active, debugger_visualizer, "1.62.0", Some(95939), None),
     /// Allows declarative macros 2.0 (`macro`).
     (active, decl_macro, "1.17.0", Some(39412), None),
     /// Allows rustc to inject a default alloc_error_handler

compiler/rustc_feature/src/builtin_attrs.rs

@@ -379,6 +379,12 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     // Unstable attributes:
     // ==========================================================================
 
+    // RFC #3191: #[debugger_visualizer] support
+    gated!(
+        debugger_visualizer, Normal, template!(List: r#"natvis_file = "...""#),
+        DuplicatesOk, experimental!(debugger_visualizer)
+    ),
+
     // Linking:
     gated!(naked, Normal, template!(Word), WarnFollowing, naked_functions, experimental!(naked)),
     gated!(