Let Miri see the AllocId for all TyCtxt allocations

Author: saethlin

compiler/rustc_middle/src/mir/interpret/mod.rs

@@ -525,6 +525,13 @@ impl<'tcx> TyCtxt<'tcx> {
         self.alloc_map.lock().reserve()
     }
 
+    /// Miri's provenance GC needs to see all live allocations. The interpreter manages most
+    /// allocations but some are managed by [`TyCtxt`] and without this method the interpreter
+    /// doesn't know their [`AllocId`]s are in use.
+    pub fn iter_allocs<F: FnMut(AllocId)>(self, func: F) {
+        self.alloc_map.lock().alloc_map.keys().copied().for_each(func)
+    }
+
     /// Reserves a new ID *if* this allocation has not been dedup-reserved before.
     /// Should only be used for "symbolic" allocations (function pointers, vtables, statics), we
     /// don't want to dedup IDs for "real" memory!