FE: add & fix test with intersection property shadowed by base field

compiler/testData/diagnostics/tests/derivedIntersectionPropertyShadowsBaseClassField.fir.kt

@@ -0,0 +1,23 @@
+// WITH_STDLIB
+// FIR_DUMP
+// FILE: Base.java
+
+public class Base {
+    public String x = "";
+}
+
+// FILE: test.kt
+
+interface Proxy {
+    val x: String
+}
+
+open class Intermediate : Base() {
+    val x get() = " "
+}
+
+class Derived : Proxy, Intermediate() {
+    fun test() {
+        x
+    }
+}

compiler/testData/diagnostics/tests/derivedIntersectionPropertyShadowsBaseClassField.fir.txt

@@ -0,0 +1,27 @@
+FILE: test.kt
+    public abstract interface Proxy : R|kotlin/Any| {
+        public abstract val x: R|kotlin/String|
+            public get(): R|kotlin/String|
+
+    }
+    public open class Intermediate : R|Base| {
+        public constructor(): R|Intermediate| {
+            super<R|Base|>()
+        }
+
+        public final val x: R|kotlin/String|
+            public get(): R|kotlin/String| {
+                ^ String( )
+            }
+
+    }
+    public final class Derived : R|Proxy|, R|Intermediate| {
+        public constructor(): R|Derived| {
+            super<R|Intermediate|>()
+        }
+
+        public final fun test(): R|kotlin/Unit| {
+            this@R|/Derived|.R|/Proxy.x|
+        }
+
+    }

compiler/testData/diagnostics/tests/derivedIntersectionPropertyShadowsBaseClassField.kt

@@ -0,0 +1,23 @@
+// WITH_STDLIB
+// FIR_DUMP
+// FILE: Base.java
+
+public class Base {
+    public String x = "";
+}
+
+// FILE: test.kt
+
+interface Proxy {
+    val x: String
+}
+
+open class Intermediate : Base() {
+    val x get() = " "
+}
+
+class Derived : Proxy, Intermediate() {
+    fun test() {
+        <!BASE_CLASS_FIELD_SHADOWS_DERIVED_CLASS_PROPERTY!>x<!>
+    }
+}

compiler/testData/diagnostics/tests/derivedIntersectionPropertyShadowsBaseClassField.txt

@@ -0,0 +1,36 @@
+package
+
+public open class Base {
+    public constructor Base()
+    public final var x: kotlin.String!
+    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 final class Derived : Proxy, Intermediate {
+    public constructor Derived()
+    public final override /*2*/ /*fake_override*/ val x: kotlin.String
+    public final override /*1*/ /*fake_override*/ var x: kotlin.String!
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public final fun test(): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public open class Intermediate : Base {
+    public constructor Intermediate()
+    public final val x: kotlin.String
+    public final override /*1*/ /*fake_override*/ var x: kotlin.String!
+    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 interface Proxy {
+    public abstract val x: kotlin.String
+    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
+}
+