Include metadata in AOT to expand inline frames in stack traces and provide line numbers.

runtime/vm/precompiler.h

Index: runtime/vm/precompiler.h
diff --git a/runtime/vm/precompiler.h b/runtime/vm/precompiler.h
index 6f504f18c8c4401fbe6b5f9b3d0483ab111b25d4..e47674cfda4c8ab1d062216decb4e7702d8a421e 100644
--- a/runtime/vm/precompiler.h
+++ b/runtime/vm/precompiler.h
@@ -87,6 +87,27 @@ class StackMapKeyValueTrait {
 typedef DirectChainedHashMap<StackMapKeyValueTrait> StackMapSet;
 
 
+class CodeSourceMapKeyValueTrait {
+ public:
+  // Typedefs needed for the DirectChainedHashMap template.
+  typedef const CodeSourceMap* Key;
+  typedef const CodeSourceMap* Value;
+  typedef const CodeSourceMap* Pair;
+
+  static Key KeyOf(Pair kv) { return kv; }
+
+  static Value ValueOf(Pair kv) { return kv; }
+
+  static inline intptr_t Hashcode(Key key) { return key->Length(); }
+
+  static inline bool IsKeyEqual(Pair pair, Key key) {
+    return pair->Equals(*key);
+  }
+};
+
+typedef DirectChainedHashMap<CodeSourceMapKeyValueTrait> CodeSourceMapSet;
+
+
 class ArrayKeyValueTrait {
  public:
   // Typedefs needed for the DirectChainedHashMap template.
@@ -461,6 +482,7 @@ class Precompiler : public ValueObject {
   void SwitchICCalls();
   void ShareMegamorphicBuckets();
   void DedupStackMaps();
+  void DedupCodeSourceMaps();
   void DedupLists();
   void DedupInstructions();
   void ResetPrecompilerState();