JVM KT-47851 fix redundant checkcast elimination

compiler/testData/codegen/box/checkcastOptimization/kt47851.kt

@@ -0,0 +1,21 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// FIR status: result.getMethod OK in FE1.0, unresolved in FIR
+
+class C(val value: String) {
+    fun getField() = value
+    fun getMethod() {}
+}
+
+fun foo(): Any {
+    var result: Any = ""
+    result = C("OK")
+    try {
+        result = result.getField()
+    } catch (e: Exception) {
+        result.getMethod()
+    }
+    return result
+}
+
+
+fun box() = foo().toString()

compiler/testData/codegen/box/checkcastOptimization/kt47851a.kt

@@ -0,0 +1,30 @@
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// FIR status: result.getMethod OK in FE1.0, unresolved in FIR
+// WITH_RUNTIME
+// FULL_JDK
+
+val defaultStringConverter = fun(s: String): Any {
+    var result: Any = s
+    var m: Array<String>? = arrayOf("1", "2", "3", "4")
+    if (m != null) {
+        val fname = m[4]
+        try {
+            result = Class.forName(m[1])
+            if (fname != "") {
+                try {
+                    val f = result.getField(fname)
+                    result = f.get(null)
+                } catch (nfe: NoSuchFieldException) {
+                    val meth = result.getMethod(fname)
+                }
+            }
+        } catch (cnfe: ClassNotFoundException) {
+        }
+    }
+    return result
+}
+
+// Just check that there's no VerifyError.
+// Semantics is checked in kt47851.kt.
+fun box() = "OK"