KT-9377 Support is-checks for read-only collections

Generate better code for 'as?' with mutable collection types:
use CHECKCAST, do not introduce special intrinsics for safe-as.

compiler/testData/codegen/bytecodeText/safeAsWithMutable.kt

@@ -0,0 +1,13 @@
+// For mutable collections and related types (e.g., MutableList, MutableListIterator)
+// 'as?' should be generated as a single 'safeAs...' intrinsic call
+// without instanceof or 'is...'.
+
+fun test() {
+    val x: Any = arrayListOf("abc", "def")
+    x as? MutableList<*>
+}
+
+// 0 INSTANCEOF
+// 1 INVOKESTATIC kotlin/jvm/internal/TypeIntrinsics\.isMutableList
+// 0 INVOKESTATIC kotlin/jvm/internal/TypeIntrinsics\.asMutableList
+// 1 CHECKCAST java/util/List