[turbofan] Don't compute unneeded gray set in AllNodes.

test/cctest/compiler/test-osr.cc

Index: test/cctest/compiler/test-osr.cc
diff --git a/test/cctest/compiler/test-osr.cc b/test/cctest/compiler/test-osr.cc
index e3963901a53584bfa2357609ad7bc9e37b8d2a84..83e0fd0516221ad0bb6976c71d28f8df1a795b5d 100644
--- a/test/cctest/compiler/test-osr.cc
+++ b/test/cctest/compiler/test-osr.cc
@@ -122,7 +122,12 @@ class OsrDeconstructorTester : public HandleAndZoneScope {
     CHECK(!nodes.IsLive(osr_normal_entry));
     CHECK(!nodes.IsLive(osr_loop_entry));
     // No dangling nodes should be left over.
-    CHECK_EQ(0u, nodes.gray.size());
+    for (Node* const node : nodes.live) {
+      for (Node* const use : node->uses()) {
+        CHECK(std::find(nodes.live.begin(), nodes.live.end(), use) !=
+              nodes.live.end());
+      }
+    }
   }
 };