JVM IR: lookup symbols by name in ProgressionHandlers in known classes only

Alternatively, we could improve the lookup utilities and their usages to
always find the exact override of a symbol from
Collection/Iterable/CharSequence/etc, but since we need to load the
original symbol anyway in cases when the loop subject's type is a type
parameter, we might as well simplify everything and always reference the
original symbol.

Also improve exception message and removed unused declarations in
IrBackendUtils.kt.

compiler/testData/codegen/box/ranges/forInCustomIterable.kt

@@ -0,0 +1,20 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// WITH_RUNTIME
+// KJS_WITH_FULL_RUNTIME
+
+class C : Iterable<String> {
+    // Unused declaration, which is here only to confuse the backend who might lookup symbols by name
+    private fun List<Int>.iterator(): Double = size.toDouble()
+
+    override fun iterator(): Iterator<String> = listOf("OK").iterator()
+}
+
+fun box(): String {
+    val c = C()
+    for ((i, x) in c.withIndex()) {
+        if (i == 0) {
+            return x
+        }
+    }
+    return "Fail"
+}