KT-6628 Allow imports of classes from root package

#KT-6628 Fixed

compiler/testData/diagnostics/tests/imports/DontImportRootScope.kt

@@ -1,25 +0,0 @@
-// FILE: rootPackage.kt
-class Klass {
-}
-
-fun function() = ""
-
-val property = ""
-
-// FILE: anotherFromRootPackage.kt
-fun foo() {
-    Klass()
-    function() + property
-}
-
-// FILE: anotherFromRootPackage.kt
-package pkg
-
-import <!UNRESOLVED_REFERENCE!>Klass<!>
-import <!UNRESOLVED_REFERENCE!>function<!>
-import <!UNRESOLVED_REFERENCE!>property<!>
-
-fun foo() {
-    <!UNRESOLVED_REFERENCE!>Klass<!>()
-    <!UNRESOLVED_REFERENCE!>function<!>() <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>+<!> <!UNRESOLVED_REFERENCE!>property<!>
-}

compiler/testData/diagnostics/tests/imports/ImportFromRootPackage.kt

@@ -0,0 +1,25 @@
+// FILE: rootPackage.kt
+class Klass {
+}
+
+fun function() = ""
+
+val property = ""
+
+// FILE: anotherFromRootPackage.kt
+fun foo(): Klass {
+    function() + property
+    return Klass()
+}
+
+// FILE: anotherFromRootPackage.kt
+package pkg
+
+import Klass
+import function
+import property
+
+fun foo(): Klass {
+    function() + property
+    return Klass()
+}

compiler/testData/diagnostics/tests/imports/ImportFromRootPackage.txt

@@ -1,7 +1,7 @@
 package
 
 internal val property: kotlin.String = ""
-internal fun foo(): kotlin.Unit
+internal fun foo(): Klass
 internal fun function(): kotlin.String
 
 internal final class Klass {
@@ -12,5 +12,5 @@ internal final class Klass {
 }
 
 package pkg {
-    internal fun foo(): kotlin.Unit
+    internal fun foo(): Klass
 }

compiler/testData/diagnostics/tests/imports/ImportsUselessSimpleImport.kt

@@ -1,5 +0,0 @@
-package a
-
-import <!USELESS_SIMPLE_IMPORT!>a<!>
-
-object B {}

compiler/testData/diagnostics/tests/imports/ImportsUselessSimpleImport.txt

@@ -1,18 +0,0 @@
-package
-
-package a {
-
-    internal object B {
-        private constructor B()
-        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-
-        public class object <class-object-for-B> : a.B {
-            private constructor <class-object-for-B>()
-            public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-            public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-            public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-        }
-    }
-}

compiler/testData/diagnostics/tests/imports/ImportsUselessSimpleImport2.kt

@@ -1,9 +0,0 @@
-// FILE:a.kt
-package a
-
-import <!USELESS_SIMPLE_IMPORT!>b<!>
-
-// FILE:b.kt
-package b
-
-class B()

compiler/testData/diagnostics/tests/imports/ImportsUselessSimpleImport2.txt

@@ -1,14 +0,0 @@
-package
-
-package a {
-}
-
-package b {
-
-    internal final class B {
-        public constructor B()
-        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-    }
-}

compiler/testData/diagnostics/tests/j+k/kt2152.kt

@@ -6,5 +6,5 @@ public class Ccc extends Bbb {
 }
 
 //FILE: Ddd.kt
-import <!USELESS_SIMPLE_IMPORT!>Ccc<!>
+import Ccc