Make compile-time errors catchable

runtime/vm/exceptions.h

Index: runtime/vm/exceptions.h
diff --git a/runtime/vm/exceptions.h b/runtime/vm/exceptions.h
index e0a64c86f9d2efea5294a0d01467c41b7375b4ea..e85f100bc479e92fe649fd6743dcfa4273cf043b 100644
--- a/runtime/vm/exceptions.h
+++ b/runtime/vm/exceptions.h
@@ -15,6 +15,7 @@ class AbstractType;
 class Array;
 class DartFrameIterator;
 class Error;
+class LanguageError;
 class Instance;
 class Integer;
 class RawInstance;
@@ -60,6 +61,7 @@ class Exceptions : AllStatic {
     kFallThrough,
     kAbstractClassInstantiation,
     kCyclicInitializationError,
+    kCompileTimeError,
   };
 
   static void ThrowByType(ExceptionType type, const Array& arguments);
@@ -72,6 +74,7 @@ class Exceptions : AllStatic {
                               const Integer& argument_value,
                               intptr_t expected_from,
                               intptr_t expected_to);
+  static void ThrowCompileTimeError(const LanguageError& error);
 
   // Returns a RawInstance if the exception is successfully created,
   // otherwise returns a RawError.