Revert "Cleanup VM error handling."

runtime/vm/exceptions.h

Index: runtime/vm/exceptions.h
diff --git a/runtime/vm/exceptions.h b/runtime/vm/exceptions.h
index 9d4a18ed1d2504a82655bb899c9c6ffb2b4bb467..b762627186b971e670d6ccfe80924cf24e251781 100644
--- a/runtime/vm/exceptions.h
+++ b/runtime/vm/exceptions.h
@@ -37,6 +37,10 @@ class Exceptions : AllStatic {
                        const Class& cls,
                        const char* field_name,
                        const Object& value);
+  static void SetLocationFields(const Instance& instance,
+                                const Class& cls,
+                                const Script& script,
+                                intptr_t location);
   static void CreateAndThrowTypeError(intptr_t location,
                                       const String& src_type_name,
                                       const String& dst_type_name,
@@ -57,11 +61,6 @@ class Exceptions : AllStatic {
     kIsolateSpawn,
     kIsolateUnhandledException,
     kFiftyThreeBitOverflowError,
-    kAssertion,
-    kCast,
-    kType,
-    kFallThrough,
-    kAbstractClassInstantiation,
   };
 
   static void ThrowByType(ExceptionType type, const Array& arguments);