Compact the symbol table when creating core snapshots or JIT app snapshots.

runtime/vm/symbols.h

Index: runtime/vm/symbols.h
diff --git a/runtime/vm/symbols.h b/runtime/vm/symbols.h
index c7f3a0c4e663eb94a16473fa619d6e080cd0b8db..7de54f525dca6408a3ff67acb48fe14995a31222 100644
--- a/runtime/vm/symbols.h
+++ b/runtime/vm/symbols.h
@@ -571,10 +571,8 @@ class Symbols : public AllStatic {
 
   static RawArray* UnifiedSymbolTable();
 
-#if defined(DART_PRECOMPILER)
   // Treat the symbol table as weak and collect garbage.
   static void Compact(Isolate* isolate);
-#endif
 
   // Creates a Symbol given a C string that is assumed to contain
   // UTF-8 encoded characters and '\0' is considered a termination character.
@@ -637,7 +635,7 @@ class Symbols : public AllStatic {
     return reinterpret_cast<RawString**>(&predefined_);
   }
 
-  static void DumpStats();
+  static void DumpStats(Isolate* isolate);
 
   // Returns Symbol::Null if no symbol is found.
   template <typename StringType>