KT-43217 Encode @EnhancedNullability types in IdSignature

compiler/testData/codegen/bytecodeListing/kt43217.kt

@@ -0,0 +1,46 @@
+// FILE: kt43217.kt
+class A {
+    private val b =
+        object : DoubleExpression() {
+            override fun get(): Double {
+                return 0.0
+            }
+        }
+}
+
+class C : DoubleExpression() {
+    override fun get() = 0.0
+}
+
+// FILE: DoubleExpression.java
+import org.jetbrains.annotations.NotNull;
+
+public abstract class DoubleExpression implements ObservableDouble {
+    @NotNull
+    @Override
+    public Object isEqualTo(double value) {
+        return null;
+    }
+}
+
+// FILE: ObservableValue.java
+import org.jetbrains.annotations.NotNull;
+
+public interface ObservableValue<T> {
+    @NotNull
+    T get();
+
+    @NotNull
+    default Object isEqualTo(@NotNull T value) {
+        return null;
+    }
+}
+
+// FILE: ObservableDouble.java
+import org.jetbrains.annotations.NotNull;
+
+public interface ObservableDouble extends ObservableValue<Double> {
+    @NotNull
+    Object isEqualTo(double value);
+}
+

compiler/testData/codegen/bytecodeListing/kt43217.txt

@@ -0,0 +1,25 @@
+@kotlin.Metadata
+public final class A$b$1 {
+    // source: 'kt43217.kt'
+    enclosing method A.<init>()V
+    inner (anonymous) class A$b$1
+    method <init>(): void
+    public @org.jetbrains.annotations.NotNull method get(): java.lang.Double
+    public synthetic bridge method get(): java.lang.Object
+}
+
+@kotlin.Metadata
+public final class A {
+    // source: 'kt43217.kt'
+    private final field b: A$b$1
+    inner (anonymous) class A$b$1
+    public method <init>(): void
+}
+
+@kotlin.Metadata
+public final class C {
+    // source: 'kt43217.kt'
+    public method <init>(): void
+    public @org.jetbrains.annotations.NotNull method get(): java.lang.Double
+    public synthetic bridge method get(): java.lang.Object
+}

compiler/testData/codegen/bytecodeListing/kt43217_ir.txt

@@ -0,0 +1,25 @@
+@kotlin.Metadata
+public final class A$b$1 {
+    // source: 'kt43217.kt'
+    enclosing method A.<init>()V
+    inner (anonymous) class A$b$1
+    method <init>(): void
+    public @org.jetbrains.annotations.NotNull method get(): java.lang.Double
+    public synthetic bridge method get(): java.lang.Object
+}
+
+@kotlin.Metadata
+public final class A {
+    // source: 'kt43217.kt'
+    private final @org.jetbrains.annotations.NotNull field b: A$b$1
+    inner (anonymous) class A$b$1
+    public method <init>(): void
+}
+
+@kotlin.Metadata
+public final class C {
+    // source: 'kt43217.kt'
+    public method <init>(): void
+    public @org.jetbrains.annotations.NotNull method get(): java.lang.Double
+    public synthetic bridge method get(): java.lang.Object
+}