JVM: remove TypedNullValue, hack interpreter instead

compiler/ir/backend.jvm/codegen/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt

@@ -657,18 +657,6 @@ class ExpressionCodegen(
             val value = initializer.accept(this, data)
             initializer.markLineNumber(startOffset = true)
             value.materializeAt(varType, declaration.type)
-            // We need to generate CHECKCAST from ACONST_NULL here for coroutines,
-            // since otherwise, upon spilling and then unspilling, we will get VerifyError,
-            // because state-machine builder does not know the type of the ACONST_NULL
-            // and assumes it to be Ljava/lang/Object;, which is incorrect.
-            // Generating CHECKCAST hints the state-machine builder the type of the variable
-            // avoiding the issue of VerifyError. See KT-51718
-            // Exception is Ljava/lang/Object;, since CHECKCAST Ljava/lang/Object; is effectively no-op.
-            if (initializer.isNullConst() && varType != OBJECT_TYPE &&
-                (irFunction.isSuspend || irFunction.isInvokeSuspendOfLambda())
-            ) {
-                mv.checkcast(varType)
-            }
             declaration.markLineNumber(startOffset = true)
             mv.store(index, varType)
         } else if (declaration.isVisibleInLVT) {