Remove codegen tests out of JetNpeTest

compiler/testData/codegen/primitiveTypes/intLiteralIsNotNull.kt

@@ -0,0 +1 @@
+fun box() = if (10!! == 10) "OK" else "fail"

compiler/testData/codegen/primitiveTypes/nullAsNullableIntIsNull.kt

@@ -0,0 +1,9 @@
+fun box(): String {
+    try {
+        if ((null : Int?)!! == 10) return "Fail #1"
+        return "Fail #2"
+    }
+    catch (e: Exception) {
+        return "OK"
+    }
+}