codegen doesn't produce line tracing commands anymore; fixes #1344

tests/misc/trangechecks.nim

@@ -0,0 +1,43 @@
+discard """
+  output: '''10
+10
+1
+1
+true'''
+"""
+
+# bug #1344
+
+var expected: int
+var x: range[1..10] = 10
+
+try:
+  x += 1
+  echo x
+except OverflowError, RangeError:
+  expected += 1
+  echo x
+
+try:
+  inc x
+  echo x
+except OverflowError, RangeError:
+  expected += 1
+  echo x
+
+x = 1
+try:
+  x -= 1
+  echo x
+except OverflowError, RangeError:
+  expected += 1
+  echo x
+
+try:
+  dec x
+  echo x
+except OverflowError, RangeError:
+  expected += 1
+  echo x
+
+echo expected == 4