record llvm cgu instruction stats
diff --git a/Cargo.lock b/Cargo.lock
index 3ffa9e5..d74b0a9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3801,6 +3801,8 @@
  "rustc_span",
  "rustc_symbol_mangling",
  "rustc_target",
+ "serde",
+ "serde_json",
  "smallvec",
  "tempfile",
  "tracing",