[tree-ssa] tree-ssa vs. fold

[Richard Kenner]

    While (d) is certainly desirable, there is an even more
    short-term solution that would probably benefit mainline
    as well: a SAVE_EXPR shouldn't have been created for a
    simple non-volatile DECL.

I don't think that's right.  You could have an object whose size depends on
a non-volatile variable and then modify the variable before one use of
the size.  The SAVE_EXPR forces proper evaluation in that case.