[Wasm] Fix invalid cast generation for inline classes

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/AutoboxingTransformer.kt

@@ -11,7 +11,6 @@ import org.jetbrains.kotlin.backend.common.lower.AbstractValueUsageTransformer
 import org.jetbrains.kotlin.backend.common.pop
 import org.jetbrains.kotlin.backend.common.push
 import org.jetbrains.kotlin.ir.IrBuiltIns
-import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.backend.js.JsCommonBackendContext
 import org.jetbrains.kotlin.ir.backend.js.ir.JsIrBuilder
 import org.jetbrains.kotlin.ir.backend.js.utils.realOverrideTarget
@@ -136,14 +135,6 @@ class AutoboxingTransformer(context: JsCommonBackendContext) : AbstractValueUsag
         return res
     }
 
-    override fun visitFunction(declaration: IrFunction): IrStatement {
-        return super.visitFunction(declaration)
-    }
-
-    override fun visitVararg(expression: IrVararg): IrExpression {
-        return super.visitVararg(expression)
-    }
-
     override fun IrExpression.useAsResult(enclosing: IrExpression): IrExpression {
         if (processingReturnStack.lastOrNull()?.value == enclosing && enclosing is IrReturnableBlock) {
             return useReturnableExpressionAsType(enclosing.type)

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/ir2wasm/BodyGenerator.kt

@@ -739,7 +739,11 @@ class BodyGenerator(
 
         // REF -> REF -> REF_CAST
         if (!expectedIsPrimitive) {
-            generateRefNullCast(actualTypeErased, expectedTypeErased)
+            if (expectedClassErased.isSubclassOf(actualClassErased)) {
+                generateRefNullCast(actualTypeErased, expectedTypeErased)
+            } else {
+                body.buildUnreachable()
+            }
         }
     }