Add public_libs_diff to the ExecutorInspector

Author: Rexagon

executor/src/lib.rs

@@ -198,12 +198,24 @@ impl<'a> Executor<'a> {
 pub struct ExecutorInspector<'e> {
     /// Actions list from compute phase.
     pub actions: Option<Cell>,
+    /// A set of changes of the public libraries dict.
+    ///
+    /// NOTE: The order is the same as the actions order so
+    /// it can contain duplicates and must be folded before use.
+    pub public_libs_diff: Vec<PublicLibraryChange>,
     /// Compute phase exit code.
     pub exit_code: Option<i32>,
     /// Debug output target.
     pub debug: Option<&'e mut dyn std::fmt::Write>,
 }
 
+/// Public library diff operation.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum PublicLibraryChange {
+    Add(Cell),
+    Remove(HashBytes),
+}
+
 /// Shared state for executor phases.
 pub struct ExecutorState<'a> {
     pub params: &'a ExecutorParams,