Add Dart_IsPrecompiledRuntime to help simplify logic in embedders that conditionally use precompila…

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index ace5b54e932d9b18f291c592e938f347f7ced25a..a53ede7909ea2035b94d7b2defc00a3f3fb9161e 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -6300,4 +6300,13 @@ DART_EXPORT bool Dart_IsRunningPrecompiledCode() {
   return Snapshot::IncludesCode(Dart::snapshot_kind());
 }
 
+
+DART_EXPORT bool Dart_IsPrecompiledRuntime() {
+#if defined(DART_PRECOMPILED_RUNTIME)
+  return true;
+#else
+  return false;
+#endif
+}
+
 }  // namespace dart