https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119140

--- Comment #1 from Siddhesh Poyarekar <siddhesh at gcc dot gnu.org> ---
How about emitting .ACCESS_WITH_SIZE for p (or in case of foo, the return
value), i.e.

const __SIZE_TYPE__ sz = sizeof (b) - i;
.ACCESS_WITH_SIZE(&p, &sz, ...)

which should survive optimizations and in a later ubsan pass, look at
.UBSAN_BOUNDS lhs to see if it has any .ACCESS_WITH_SIZE calls and then adjust
the size accordingly?

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