Use original descriptor when mapping fake override

Otherwise wrong CONFLICTING_INHERITED_JVM_DECLARATIONS were reported

 #KT-10691 Fixed

compiler/testData/codegen/box/bridges/substitutionInSuperClass/differentErasureInSuperClass.kt

@@ -0,0 +1,15 @@
+public open class A<T> {
+    fun foo(x: T) = "O"
+    fun foo(x: A<T>) = "K"
+}
+
+// Shoudt not be reported CONFLICTING_INHERITED_JVM_DECLARATIONS
+class B : A<A<String>>()
+
+fun box(): String {
+    val x: A<String> = A()
+    val y: A<A<String>> = A()
+    val b = B()
+
+    return b.foo(x) + b.foo(y)
+}

compiler/testData/codegen/box/bridges/substitutionInSuperClass/differentErasureInSuperClassComplex.kt

@@ -0,0 +1,35 @@
+public open class A<T> {
+    fun foo(x: T) = "O"
+    fun foo(x: A<T>) = "K"
+}
+
+interface C<E> {
+    fun foo(x: E): String
+    fun foo(x: A<E>): String
+}
+
+interface D {
+    fun foo(x: A<A<String>>): String
+}
+
+// Shoudt not be reported CONFLICTING_INHERITED_JVM_DECLARATIONS
+class B : A<A<String>>(), C<A<String>>, D
+
+fun box(): String {
+    val x: A<String> = A()
+    val y: A<A<String>> = A()
+
+    val b = B()
+    val bResult = b.foo(x) + b.foo(y)
+    if (bResult != "OK") return "fail 1: $bResult"
+
+    val c: C<A<String>> = B()
+    val cResult = c.foo(x) + c.foo(y)
+    if (cResult != "OK") return "fail 2: $cResult"
+
+    val d: D = B()
+
+    if (d.foo(y) != "K") return "fail 3"
+
+    return "OK"
+}