Support for checking loaded descriptors agains an expected txt file

compiler/testData/lazyResolve/diagnostics/operatorsOverloading/AssignOperatorAmbiguity.txt

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+namespace <root>
+
+// <namespace name="kt1820">
+namespace kt1820
+
+internal final class kt1820.MyInt : jet.Any {
+    public final /*constructor*/ fun <init>(/*0*/ i: jet.Int): kt1820.MyInt
+    internal final val i: jet.Int
+    internal final fun plus(/*0*/ m: kt1820.MyInt): kt1820.MyInt
+}
+internal final fun jet.Any.plusAssign(/*0*/ a: jet.Any): jet.Tuple0
+internal final fun test(/*0*/ m: kt1820.MyInt): jet.Tuple0
+// </namespace name="kt1820">

compiler/testData/lazyResolve/diagnostics/operatorsOverloading/IteratorAmbiguity.txt

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+namespace <root>
+
+internal abstract trait MyAnotherCollectionInterface : jet.Any {
+}
+internal final class MyCollection : MyCollectionInterface, MyAnotherCollectionInterface {
+    public final /*constructor*/ fun <init>(): MyCollection
+}
+internal abstract trait MyCollectionInterface : jet.Any {
+}
+internal final class MyElement : jet.Any {
+    public final /*constructor*/ fun <init>(): MyElement
+}
+internal final class MyIterator : jet.Any {
+    public final /*constructor*/ fun <init>(): MyIterator
+    internal final fun hasNext(): jet.Boolean
+    internal final fun next(): MyElement
+}
+internal final fun MyAnotherCollectionInterface.iterator(): MyIterator
+internal final fun MyCollectionInterface.iterator(): MyIterator
+internal final fun test1(/*0*/ collection: MyCollection): jet.Tuple0

compiler/testData/lazyResolve/diagnostics/operatorsOverloading/kt1028.txt

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+namespace <root>
+
+// <namespace name="kt1028">
+namespace kt1028
+
+internal final class kt1028.Control : jet.Any {
+    public final /*constructor*/ fun <init>(): kt1028.Control
+    public final val MouseMoved: kt1028.event<kt1028.MouseMovedEventArgs>
+    internal final fun MoveMouse(): jet.Tuple0
+}
+internal final class kt1028.MouseMovedEventArgs : jet.Any {
+    public final /*constructor*/ fun <init>(): kt1028.MouseMovedEventArgs
+    public final val X: jet.Int
+}
+internal final class kt1028.Test : jet.Any {
+    public final /*constructor*/ fun <init>(): kt1028.Test
+    internal final fun test(): jet.Tuple0
+}
+internal final class kt1028.event</*0*/ T : jet.Any?> : jet.Any {
+    public final /*constructor*/ fun </*0*/ T : jet.Any?><init>(): kt1028.event<T>
+    internal final fun call(/*0*/ value: T): jet.Tuple0
+    internal final val callbacks: java.util.ArrayList<jet.Function1<T, jet.Tuple0>>
+    internal final fun minusAssign(/*0*/ f: jet.Function1<T, jet.Tuple0>): jet.Boolean
+    internal final fun plusAssign(/*0*/ f: jet.Function1<T, jet.Tuple0>): jet.Boolean
+}
+// </namespace name="kt1028">