[LL FIR] do not crash on attempt to resolve class initializer in case of class clash

^KT-61788 Fixed

analysis/low-level-api-fir/testData/getOrBuildFir/declarations/initializerConflict.kt

@@ -0,0 +1,11 @@
+// LOOK_UP_FOR_ELEMENT_OF_TYPE: org.jetbrains.kotlin.psi.KtClassInitializer
+
+package one.two
+
+class A
+typealias Foo = A
+class Foo {
+    <expr>init {
+        val i = 1
+    }</expr>
+}

analysis/low-level-api-fir/testData/getOrBuildFir/declarations/initializerConflict.txt

@@ -0,0 +1,30 @@
+KT element: KtClassInitializer
+FIR element: FirAnonymousInitializerImpl
+FIR source kind: KtRealSourceElementKind
+
+FIR element rendered:
+init {
+    [ResolvedTo(RAW_FIR)] lval i: R|kotlin/Int| = Int(1)
+}
+
+FIR FILE:
+FILE: [ResolvedTo(IMPORTS)] initializerConflict.kt
+    package one.two
+
+    public final [ResolvedTo(STATUS)] class A : R|kotlin/Any| {
+        public [ResolvedTo(STATUS)] [ContainingClassKey=A] constructor(): R|one/two/A| {
+            LAZY_super<R|kotlin/Any|>
+        }
+
+    }
+    public? final [ResolvedTo(SUPER_TYPES)] typealias Foo = R|one/two/A|
+    public final [ResolvedTo(STATUS)] class Foo : R|kotlin/Any| {
+        public [ResolvedTo(STATUS)] [ContainingClassKey=Foo] constructor(): R|one/two/Foo| {
+            LAZY_super<R|kotlin/Any|>
+        }
+
+        init {
+            [ResolvedTo(RAW_FIR)] lval i: R|kotlin/Int| = Int(1)
+        }
+
+    }