Fixed nullability for return and parameter types in SAM-adapters

compiler/testData/diagnostics/tests/syntheticExtensions/javaProperties/TypeAnnotation.kt

@@ -0,0 +1,13 @@
+// FILE: KotlinFile.kt
+fun foo(javaClass: JavaClass) {
+    javaClass.getSomething()<!UNSAFE_CALL!>.<!>length()
+    javaClass.something<!UNSAFE_CALL!>.<!>length()
+}
+
+// FILE: JavaClass.java
+import org.jetbrains.annotations.*;
+
+public class JavaClass {
+    @Nullable
+    public String getSomething() { return null; }
+}

compiler/testData/diagnostics/tests/syntheticExtensions/javaProperties/TypeAnnotation.txt

@@ -0,0 +1,11 @@
+package
+
+internal fun foo(/*0*/ javaClass: JavaClass): kotlin.Unit
+
+public open class JavaClass {
+    public constructor JavaClass()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    org.jetbrains.annotations.Nullable() public open fun getSomething(): kotlin.String?
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}