Don't call removeReverseDep on a non-incremental node entry in tests.

It's illegal. There must be some race in propagating the failure from the async thread since the test is only flakily failing since 20c541c (albeit at a very high rate).

PiperOrigin-RevId: 556074380
Change-Id: I6c177d0346cb9849b5aa81c104ad9295548f5a84

src/test/java/com/google/devtools/build/skyframe/GraphTest.java

@@ -260,7 +260,9 @@ public void testAddRemoveRdeps() throws Exception {
               waitForAddedRdep.countDown();
               waitForSetValue.await(TestUtils.WAIT_TIMEOUT_SECONDS, SECONDS);
               for (int k = chunkSize; k <= numIterations; k++) {
-                entry.removeReverseDep(key("rdep" + j));
+                if (shouldTestIncrementality()) {
+                  entry.removeReverseDep(key("rdep" + j));
+                }
                 entry.addReverseDepAndCheckIfDone(key("rdep" + j));
                 if (shouldTestIncrementality()) {
                   entry.getReverseDepsForDoneEntry();