Use a specialized varint + bitpacking scheme for DepGraph encoding

compiler/rustc_query_system/src/dep_graph/edges.rs

@@ -0,0 +1,60 @@
+use crate::dep_graph::DepNodeIndex;
+use smallvec::SmallVec;
+use std::hash::{Hash, Hasher};
+use std::ops::Deref;
+
+#[derive(Default, Debug)]
+pub struct EdgesVec {
+    max: u32,
+    edges: SmallVec<[DepNodeIndex; EdgesVec::INLINE_CAPACITY]>,
+}
+
+impl Hash for EdgesVec {
+    #[inline]
+    fn hash<H: Hasher>(&self, hasher: &mut H) {
+        Hash::hash(&self.edges, hasher)
+    }
+}
+
+impl EdgesVec {
+    pub const INLINE_CAPACITY: usize = 8;
+
+    #[inline]
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    #[inline]
+    pub fn push(&mut self, edge: DepNodeIndex) {
+        self.max = self.max.max(edge.as_u32());
+        self.edges.push(edge);
+    }
+
+    #[inline]
+    pub fn max_index(&self) -> u32 {
+        self.max
+    }
+}
+
+impl Deref for EdgesVec {
+    type Target = [DepNodeIndex];
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        self.edges.as_slice()
+    }
+}
+
+impl FromIterator<DepNodeIndex> for EdgesVec {
+    #[inline]
+    fn from_iter<T>(iter: T) -> Self
+    where
+        T: IntoIterator<Item = DepNodeIndex>,
+    {
+        let mut vec = EdgesVec::new();
+        for index in iter {
+            vec.push(index)
+        }
+        vec
+    }
+}