reverted java highlighting: give up check of @PolymorphicSignature methods (IDEA-251449)

appeared to be a javac bug

GitOrigin-RevId: 1d17221830606f5bdc8d0db78fa97f94e9548799

java/java-psi-api/src/com/intellij/psi/PsiMethodReferenceUtil.java

@@ -1,7 +1,6 @@
 // Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.psi;
 
-import com.intellij.codeInsight.AnnotationUtil;
 import com.intellij.core.JavaPsiBundle;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.util.NlsContexts;
@@ -163,12 +162,6 @@ public final class PsiMethodReferenceUtil {
         return false;
       }
 
-      PsiElement element = result.getElement();
-      if (element instanceof PsiMethod && 
-          AnnotationUtil.isAnnotated(((PsiMethod)element), CommonClassNames.JAVA_LANG_INVOKE_MH_POLYMORPHIC, 0)) {
-        return true;
-      }
-
       if (TypeConversionUtil.isAssignable(interfaceReturnType, methodReturnType)) {
         return true;
       }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/newMethodRef/ReferencesToPolymorphicMethod.java

@@ -2,7 +2,7 @@ import java.lang.invoke.MethodHandle;
 
 class MyTest {
   private void m(MethodHandle handle) {
-    I stringSupplier = handle::invokeExact;
+    I stringSupplier = <error descr="Bad return type in method reference: cannot convert java.lang.Object to java.lang.String">handle::invokeExact</error>;
   }
 }
 interface I {