Dont search for the sdk on startup in worker mode

pkg/analyzer_cli/lib/src/options.dart

Index: pkg/analyzer_cli/lib/src/options.dart
diff --git a/pkg/analyzer_cli/lib/src/options.dart b/pkg/analyzer_cli/lib/src/options.dart
index ae8466cd017b5dd734fe94e5765d0e28a3b22268..9151f6bd293f7a60eced3f08ad6f79dfc65a2c8e 100644
--- a/pkg/analyzer_cli/lib/src/options.dart
+++ b/pkg/analyzer_cli/lib/src/options.dart
@@ -193,7 +193,7 @@ class CommandLineOptions {
       [printAndFail(String msg) = printAndFail]) {
     CommandLineOptions options = _parse(args);
     // Check SDK.
-    {
+    if (!options.buildModePersistentWorker) {
       // Infer if unspecified.
       if (options.dartSdkPath == null) {
         Directory sdkDir = getSdkDir(args);