[NI] Correctly compute definitely not null type for intersection one

{ T : Any? & Foo & Bar? }!! -> { T!! & Foo & Bar }

 Also, fix bug with loosing non-representative number type.
 For example, for type { Byte & SomeType } we lost type `Byte` because
 `getDefaultPrimitiveNumberType` returns null for it

 Fixes #KT-28334 for NI

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

@@ -21,7 +21,6 @@ import org.jetbrains.kotlin.descriptors.ClassifierDescriptor
 import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
 import org.jetbrains.kotlin.resolve.scopes.MemberScope
 import org.jetbrains.kotlin.resolve.scopes.TypeIntersectionScope
-
 import java.util.*
 
 class IntersectionTypeConstructor(typesToIntersect: Collection<KotlinType>) : TypeConstructor {
@@ -63,3 +62,22 @@ class IntersectionTypeConstructor(typesToIntersect: Collection<KotlinType>) : Ty
 
     override fun hashCode(): Int = hashCode
 }
+
+inline fun IntersectionTypeConstructor.transformComponents(
+    predicate: (KotlinType) -> Boolean = { true },
+    transform: (KotlinType) -> KotlinType
+): IntersectionTypeConstructor? {
+    var changed = false
+    val newSupertypes = supertypes.map {
+        if (predicate(it)) {
+            changed = true
+            transform(it)
+        } else {
+            it
+        }
+    }
+
+    if (!changed) return null
+
+    return IntersectionTypeConstructor(newSupertypes)
+}

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

@@ -111,7 +111,28 @@ val KotlinType.isDefinitelyNotNullType: Boolean
     get() = unwrap() is DefinitelyNotNullType
 
 fun SimpleType.makeSimpleTypeDefinitelyNotNullOrNotNull(): SimpleType =
-        DefinitelyNotNullType.makeDefinitelyNotNull(this) ?: makeNullableAsSpecified(false)
+    DefinitelyNotNullType.makeDefinitelyNotNull(this)
+        ?: makeIntersectionTypeDefinitelyNotNullOrNotNull()
+        ?: makeNullableAsSpecified(false)
 
 fun UnwrappedType.makeDefinitelyNotNullOrNotNull(): UnwrappedType =
-        DefinitelyNotNullType.makeDefinitelyNotNull(this) ?: makeNullableAsSpecified(false)
+    DefinitelyNotNullType.makeDefinitelyNotNull(this)
+        ?: makeIntersectionTypeDefinitelyNotNullOrNotNull()
+        ?: makeNullableAsSpecified(false)
+
+private fun KotlinType.makeIntersectionTypeDefinitelyNotNullOrNotNull(): SimpleType? {
+    val typeConstructor = constructor as? IntersectionTypeConstructor ?: return null
+    val definitelyNotNullConstructor = typeConstructor.makeDefinitelyNotNullOrNotNull() ?: return null
+
+    return KotlinTypeFactory.simpleTypeWithNonTrivialMemberScope(
+        annotations,
+        definitelyNotNullConstructor,
+        listOf(),
+        false,
+        definitelyNotNullConstructor.createScopeForKotlinType()
+    )
+}
+
+private fun IntersectionTypeConstructor.makeDefinitelyNotNullOrNotNull(): IntersectionTypeConstructor? {
+    return transformComponents({ TypeUtils.isNullableType(it) }, { it.unwrap().makeDefinitelyNotNullOrNotNull() })
+}

core/descriptors/src/org/jetbrains/kotlin/types/checker/NewKotlinTypeChecker.kt

@@ -153,8 +153,7 @@ object NewKotlinTypeChecker : KotlinTypeChecker {
             }
 
             is IntersectionTypeConstructor -> if (type.isMarkedNullable) {
-                val newSuperTypes = constructor.supertypes.map { it.makeNullable() }
-                val newConstructor = IntersectionTypeConstructor(newSuperTypes)
+                val newConstructor = constructor.transformComponents(transform = { it.makeNullable() }) ?: constructor
                 return KotlinTypeFactory.simpleTypeWithNonTrivialMemberScope(type.annotations, newConstructor, listOf(), false, newConstructor.createScopeForKotlinType())
             }
         }