Use Map#forEach instead of a stream in `BuildConfigurationKeyMapPro…

…ducer`.

Stream overhead shows up in profiles.

PiperOrigin-RevId: 676476809
Change-Id: I28cc2a674f56973217a0731cdebc35a44e36a9bc

src/main/java/com/google/devtools/build/lib/analysis/producers/BuildConfigurationKeyMapProducer.java

@@ -64,15 +64,14 @@ public BuildConfigurationKeyMapProducer(
 
   @Override
   public StateMachine step(Tasks tasks) {
-    this.options.entrySet().stream()
-        .map(
-            entry ->
+    options.forEach(
+        (context, buildOptions) ->
+            tasks.enqueue(
                 new BuildConfigurationKeyProducer<>(
                     (BuildConfigurationKeyProducer.ResultSink<String>) this,
                     StateMachine.DONE,
-                    entry.getKey(),
-                    entry.getValue()))
-        .forEach(tasks::enqueue);
+                    context,
+                    buildOptions)));
     return this::combineResults;
   }