ignore dep-graph when loading inlined HIR

We touch the krate to adjust the maps, but we don't expose that data
widely.

src/librustc/hir/map/mod.rs

@@ -927,6 +927,8 @@ pub fn map_decoded_item<'ast, F: FoldOps>(map: &Map<'ast>,
                                           ii: InlinedItem,
                                           fold_ops: F)
                                           -> &'ast InlinedItem {
+    let _ignore = map.forest.dep_graph.in_ignore();
+
     let mut fld = IdAndSpanUpdater::new(fold_ops);
     let ii = match ii {
         II::Item(d, i) => II::Item(fld.fold_ops.new_def_id(d),

src/test/incremental/krate-inlined.rs

@@ -0,0 +1,29 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// revisions: rpass1 rpass2
+// compile-flags: -Z query-dep-graph
+
+#![allow(warnings)]
+#![feature(rustc_attrs)]
+#![rustc_partition_reused(module="krate_inlined-x", cfg="rpass2")]
+
+fn main() { }
+
+mod x {
+    fn method() {
+        // use some methods that require inlining HIR from another crate:
+        let mut v = vec![];
+        v.push(1);
+    }
+}
+
+#[cfg(rpass1)]
+fn bar() { } // remove this unrelated fn in rpass2, which should not affect `x::method`