travis: weirdpaste -- add nil dereference test

To address BR 3392696

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

travis/test/weirdpaste.asm

@@ -24,3 +24,13 @@
 
 %define N 1e%++%+ 5
 	dd N, 1e+5
+
+;
+; test nil dereference, since we're
+; modifying with %line keep it last
+; in the file
+;
+; BR 3392696
+;
+%line 1 "`weirdpaste.asm"
+mov eax, eax

travis/test/weirdpaste.i.t

@@ -21,3 +21,13 @@
 
 
  dd 1e+5, 1e+5
+
+
+
+
+
+
+
+
+%line 2+1 '`weirdpaste.asm'
+mov eax, eax