Do not render nullability in UltraLightChecker when it's irrelevant

It's necessary because after next changes,
they become different for ultra and old light classes.
The former (ultra) is more correct but it doesn't help when
we need to compare our implementation with reference

compiler/testData/asJava/ultraLightClasses/inferringAnonymousObjectTypes.java

@@ -29,21 +29,19 @@ public final class ArrayOfAnonymous /* ArrayOfAnonymous*/ {
 }
 
 final class C /* C*/ {
-  @null()
-  private final int y;
-
   @org.jetbrains.annotations.NotNull()
   private final kotlin.jvm.functions.Function0<java.lang.Object> initChild;
 
-  @null()
+  private final int y;
-  public  C(@null() int);
 
   @null()
-  public final int getY();
+  public  C(int);
 
   @org.jetbrains.annotations.NotNull()
   public final kotlin.jvm.functions.Function0<java.lang.Object> getInitChild();
 
+  public final int getY();
+
 }
 
 public abstract class Super /* Super*/ {

idea/idea-core/src/org/jetbrains/kotlin/idea/perf/UltraLightChecker.kt

@@ -13,6 +13,9 @@ import org.jetbrains.annotations.TestOnly
 import org.jetbrains.kotlin.asJava.LightClassGenerationSupport
 import org.jetbrains.kotlin.asJava.classes.KtLightClassForSourceDeclaration
 import org.jetbrains.kotlin.asJava.classes.KtUltraLightClass
+import org.jetbrains.kotlin.asJava.classes.isPrivateOrParameterInPrivateMethod
+import org.jetbrains.kotlin.asJava.elements.KtLightNullabilityAnnotation
+import org.jetbrains.kotlin.load.kotlin.NON_EXISTENT_CLASS_NAME
 import org.jetbrains.kotlin.psi.KtClassOrObject
 import org.jetbrains.kotlin.psi.KtFile
 import org.junit.Assert
@@ -58,9 +61,13 @@ object UltraLightChecker {
     private fun PsiAnnotation.renderAnnotation() =
         "@" + qualifiedName + "(" + parameterList.attributes.joinToString { it.name + "=" + (it.value?.text ?: "?") } + ")"
 
-    private fun PsiModifierListOwner.renderModifiers(): String {
+    private fun PsiModifierListOwner.renderModifiers(typeIfApplicable: PsiType? = null): String {
         val buffer = StringBuilder()
         for (annotation in annotations) {
+            if (annotation is KtLightNullabilityAnnotation<*> && skipRenderingNullability(typeIfApplicable)) {
+                continue
+            }
+
             buffer.append(annotation.renderAnnotation())
             buffer.append(if (this is PsiParameter) " " else "\n")
         }
@@ -70,6 +77,18 @@ object UltraLightChecker {
         return buffer.toString()
     }
 
+    private fun PsiModifierListOwner.skipRenderingNullability(typeIfApplicable: PsiType?) =
+        isPrimitiveOrNonExisting(typeIfApplicable) || isPrivateOrParameterInPrivateMethod()
+
+    private val NON_EXISTENT_QUALIFIED_CLASS_NAME = NON_EXISTENT_CLASS_NAME.replace("/", ".")
+
+    private fun isPrimitiveOrNonExisting(typeIfApplicable: PsiType?): Boolean {
+        if (typeIfApplicable is PsiPrimitiveType) return true
+        if (typeIfApplicable?.getCanonicalText(false) == NON_EXISTENT_QUALIFIED_CLASS_NAME) return true
+
+        return typeIfApplicable is PsiPrimitiveType
+    }
+
     private fun PsiType.renderType() = getCanonicalText(true)
 
     private fun PsiReferenceList?.renderRefList(keyword: String): String {
@@ -78,7 +97,7 @@ object UltraLightChecker {
     }
 
     private fun PsiVariable.renderVar(): String {
-        var result = this.renderModifiers() + type.renderType() + " " + name
+        var result = this.renderModifiers(type) + type.renderType() + " " + name
         if (this is PsiParameter && this.isVarArgs) {
             result += " /* vararg */"
         }
@@ -97,12 +116,12 @@ object UltraLightChecker {
         } + "> "
 
     private fun PsiMethod.renderMethod() =
-        renderModifiers() +
+        renderModifiers(returnType) +
                 (if (isVarArgs) "/* vararg */ " else "") +
                 renderTypeParams() +
                 (returnType?.renderType() ?: "") + " " +
                 name +
-                "(" + parameterList.parameters.joinToString { it.renderModifiers() + it.type.renderType() } + ")" +
+                "(" + parameterList.parameters.joinToString { it.renderModifiers(it.type) + it.type.renderType() } + ")" +
                 (this as? PsiAnnotationMethod)?.defaultValue?.let { " default " + it.text }.orEmpty() +
                 throwsList.referencedTypes.let { thrownTypes ->
                     if (thrownTypes.isEmpty()) ""