[Bug middle-end/19987] [meta-bug] fold missing optimizations in general

[rguenth at gcc dot gnu dot org]

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Bug 19987 depends on bug 21082, which changed state.

Bug 21082 Summary: &a[b] - &a[c] is not folded to b - c
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21082

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19987