Fix 957-methodhandle-transforms test

The test hardcoded one point of divergence. This is now fixed in the
transform implementation for MethodHandles.exactInvoker(). This allows
us to remove 957-methodhandle-transforms from the RI known failures list.

Bug: 73888836
Bug: 207462751
Test: art/test.py --host -r
Test: art/tools/run-libcore-tests.sh --host
Change-Id: I06ca7b3d875833a6f1c073e570eb0e21c4b15eca
diff --git a/test/957-methodhandle-transforms/src/Main.java b/test/957-methodhandle-transforms/src/Main.java
index 9803438..2b16485 100644
--- a/test/957-methodhandle-transforms/src/Main.java
+++ b/test/957-methodhandle-transforms/src/Main.java
@@ -950,12 +950,20 @@
 
     MethodHandle exactInvoker = MethodHandles.exactInvoker(target.type());
     assertEquals("barbar", (String) exactInvoker.invoke(target, "bar", "bar"));
+    assertEquals("barbar", (String) exactInvoker.invoke(target, (Object) returnBar(), "bar"));
     try {
-      String foo = (String) exactInvoker.invoke(target, (Object) returnBar(), "bar");
+      assertEquals("barbar", (String) invoker.invoke(target, (Object) Integer.valueOf(7), "bar"));
       fail();
-    } catch (WrongMethodTypeException expected) {
+    } catch (ClassCastException expected) {
     }
     try {
+      assertEquals("barbar", (String) invoker.invoke(target, (Object) null, "bar"));
+      fail();
+    } catch (NullPointerException expected) {
+    }
+    exactInvoker.invoke(target, (Object) returnBar(), "bar");
+
+    try {
       String foo = (String) exactInvoker.invoke(target, "bar", "bar", 24);
       fail();
     } catch (WrongMethodTypeException expected) {
diff --git a/test/knownfailures.json b/test/knownfailures.json
index ce4ada4..f68f6f0 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -1058,7 +1058,6 @@
           "954-invoke-polymorphic-verifier",
           "955-methodhandles-smali",
           "956-methodhandles",
-          "957-methodhandle-transforms",
           "958-methodhandle-stackframe",
           "972-default-imt-collision",
           "972-iface-super-multidex",