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Some compiler versions and distributions default to that out of the box,
while some others default to -fomit-frame-pointer. Since for sanitizers
it is important to have the frame-pointers to be able to retrieve
program tracebacks even without DWARF and faster(*), let's explicitly make
sure that what we build with comes with frame-pointers enabled.

(*) see e.g. https://github.com/google/sanitizers/wiki/AddressSanitizer#using-addresssanitizer
    for details.

/reviewed-by @jerome
/reviewed-on !24