>> Introduce dynamic shared memory areas.

gaur finds another problem with dsa.c: it uses SIZE_MAX which AFAICS
is not required to exist by POSIX.

We could adopt the timezone code's workaround

#ifndef SIZE_MAX
#define SIZE_MAX ((size_t) -1)

but I don't find that particularly nice, and in any case I wonder
why we would want to use SIZE_MAX and not MaxAllocHugeSize.  The
overflow hazards that motivate that not being the max possible
value seem relevant here too.

                        regards, tom lane

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