Change rendering for definitely non-nullable types from T!! to T & Any

^KT-26245 In Progress

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt

@@ -26,7 +26,6 @@ import org.jetbrains.kotlin.types.*
 import org.jetbrains.kotlin.types.ErrorUtils.UninferredParameterTypeConstructor
 import org.jetbrains.kotlin.types.TypeUtils.CANT_INFER_FUNCTION_PARAM_TYPE
 import org.jetbrains.kotlin.util.capitalizeDecapitalize.toLowerCaseAsciiOnly
-import java.util.*
 
 internal class DescriptorRendererImpl(
     val options: DescriptorRendererOptionsImpl
@@ -263,7 +262,7 @@ internal class DescriptorRendererImpl(
         }
 
         if (type.isDefinitelyNotNullType) {
-            append("!!")
+            append(" & Any")
         }
     }
 

core/descriptors/src/org/jetbrains/kotlin/types/SpecialTypes.kt

@@ -174,7 +174,7 @@ class DefinitelyNotNullType private constructor(
     override fun makeNullableAsSpecified(newNullability: Boolean): SimpleType =
         if (newNullability) delegate.makeNullableAsSpecified(newNullability) else this
 
-    override fun toString(): String = "$delegate!!"
+    override fun toString(): String = "$delegate & Any"
 
     @TypeRefinement
     override fun replaceDelegate(delegate: SimpleType) = DefinitelyNotNullType(delegate, useCorrectedNullabilityForTypeParameters)