Add ABI tests for classes extending Number and CharSequence

compiler/testData/codegen/bytecodeListing/specialBridges/number.kt

@@ -0,0 +1,14 @@
+// IGNORE_BACKEND: JVM_IR
+// ^ see KT-42578
+
+abstract class AbstractNumber : Number()
+
+class MyNumber : Number() {
+    override fun toByte(): Byte = 0
+    override fun toChar(): Char = 0.toChar()
+    override fun toDouble(): Double = 0.0
+    override fun toFloat(): Float = 0.0f
+    override fun toInt(): Int = 0
+    override fun toLong(): Long = 0
+    override fun toShort(): Short = 0
+}