Add test methods and data for uncommon cases

Uncommon means mostly that aren't present in raw fir builder data

compiler/visualizer/testData/uncommonCases/testFiles/where.kt

@@ -0,0 +1,10 @@
+fun <T> copyWhenGreater(list: List<T>, threshold: T): List<String>
+        where T : CharSequence,
+              T : Comparable<T> {
+    return list.filter { it > threshold }.map { it.toString() }
+}
+
+fun main() {
+    val list = listOf("1", "2", "3")
+    val copy = copyWhenGreater(list, "2")
+}