JVM_IR KT-27427 use checkNotNull with message in checked casts

This would prevent extra branching in 'as <not-null-type>', which
usually would not be covered.

compiler/testData/codegen/bytecodeText/temporaryVals/noTemporaryInCheckedCast.kt

@@ -0,0 +1,6 @@
+fun foo(): Any? = "abc"
+
+fun test() = foo() as String
+
+// 0 ASTORE
+// 0 ALOAD