Fix various instances of undefined behavior

Mostly this involves checking for NULL pointer before doing operations
that add a non-zero offset.

The exception is an overflow warning in heap_fetch_toast_slice(). This
was caused by unneeded parentheses forcing an expression to be
evaluated to a negative integer, which then got cast to size_t.

Per clang 21 undefined behavior sanitizer.

Backpatch to all supported versions.

Co-authored-by: Alexander Lakhin <[email protected]>
Reported-by: Alexander Lakhin <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 14

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/73ac2b37401d7aa910ebd81795bb0f4faf0eaab3

Modified Files
--------------
contrib/pg_trgm/trgm_gist.c               | 5 ++++-
src/backend/access/heap/heaptoast.c       | 2 +-
src/backend/utils/adt/multirangetypes.c   | 5 +++--
src/backend/utils/sort/sharedtuplestore.c | 3 ++-
4 files changed, 10 insertions(+), 5 deletions(-)

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