[FIR] Fix "Expected some types" exception, ^KT-51274 Fixed

compiler/testData/diagnostics/tests/exceptions/expectedSomeTypesOnBranchForWhenExpressionOfErroneousType.fir.kt

@@ -0,0 +1,9 @@
+// ISSUE: KT-51274
+
+fun test() {
+    val x = <!UNRESOLVED_REFERENCE!>unresolved<!>()
+    val y = when (x) {
+        is String -> x
+        else -> throw Exception()
+    }
+}

compiler/testData/diagnostics/tests/exceptions/expectedSomeTypesOnBranchForWhenExpressionOfErroneousType.kt

@@ -0,0 +1,9 @@
+// ISSUE: KT-51274
+
+fun test() {
+    val x = <!UNRESOLVED_REFERENCE!>unresolved<!>()
+    val y = when (<!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x<!>) {
+        is String -> <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x<!>
+        else -> throw Exception()
+    }
+}

compiler/testData/diagnostics/tests/exceptions/expectedSomeTypesOnBranchForWhenExpressionOfErroneousType.txt

@@ -0,0 +1,3 @@
+package
+
+public fun test(): kotlin.Unit