Check for interrupts and stack overflow in TParserGet().

TParserGet() recurses for some token types, meaning it's possible
to drive it to stack overflow.  Since this is a minority behavior,
I chose to add the check_stack_depth() call to the two places that
recurse rather than doing it during every single call.

While at it, add CHECK_FOR_INTERRUPTS(), because this can run
unpleasantly long for long inputs.

Per bug #17995 from Zuming Jiang.  This is old, so back-patch
to all supported branches.

Discussion: https://postgr.es/m/17995-9f20ff3e6389d...@postgresql.org

Branch
------
REL_12_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/3b4580f5ce984e8c47ed5932b196c83931c9ed8c

Modified Files
--------------
src/backend/tsearch/wparser_def.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

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