[Bug debug/89463] debug information for iteractor of an empty loop is gone (at -O3)

[qrzhang at gatech dot edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89463

--- Comment #4 from Qirun Zhang <qrzhang at gatech dot edu> ---
Bisect points to r151362.

commit ff79704e04af919c4fe501c7dceca8b21cced614
Author: aoliva <aoliva@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Thu Sep 3 05:24:57 2009 +0000

    * toplev.c (process_options): Enable var-tracking-assignments
    by default if var-tracking is enabled.


    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@151362
138bc75d-0d04-0410-961f-82ee72b054a4