Add package config support to dart:isolate

runtime/bin/gen_snapshot.cc

Index: runtime/bin/gen_snapshot.cc
diff --git a/runtime/bin/gen_snapshot.cc b/runtime/bin/gen_snapshot.cc
index 93611a4ce93cde33d73e5f30595528c14b2ad11a..0e12574316a7e52d0471b8b1a5f70bb2b14ef963 100644
--- a/runtime/bin/gen_snapshot.cc
+++ b/runtime/bin/gen_snapshot.cc
@@ -955,7 +955,7 @@ static void SetupForGenericSnapshotCreation() {
 static Dart_Isolate CreateServiceIsolate(const char* script_uri,
                                          const char* main,
                                          const char* package_root,
-                                         const char** package_map,
+                                         const char* package_config,
                                          Dart_IsolateFlags* flags,
                                          void* data,
                                          char** error) {
@@ -1095,7 +1095,6 @@ int main(int argc, char** argv) {
     result =
         DartUtils::PrepareForScriptLoading(package_root,
                                            NULL,
-                                           NULL,
                                            false,
                                            false,
                                            builtin_lib);