JVM_IR KT-48433 don't generate null check on 'this$0' parameter

compiler/testData/codegen/bytecodeText/constructors/innerClassConstructor.kt

@@ -0,0 +1,8 @@
+class Outer {
+    inner class Inner1
+    inner class Inner2(v: String)
+}
+
+// 1 checkNotNullParameter
+// 0 checkParameterIsNotNull
+// 1 INVOKESTATIC