pgsql: Track LLVM 18 changes.

Track LLVM 18 changes.

A function was given a newly standard name from C++20 in LLVM 16.  Then
LLVM 18 added a deprecation warning for the old name, and it is about to
ship, so it's time to adjust that.

Back-patch to all supported releases.

Discussion: https://www.postgresql.org/message-id/CA+hUKGLbuVhH6mqS8z+FwAn4=5dHs0bAWmEMZ3B+iYHWKC4-ZA@mail.gmail.com

Branch
------
REL_16_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/60ba7cae7cc758f09899429d1134a14adc35fd94

Modified Files
--------------
src/backend/jit/llvm/llvmjit_inline.cpp | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)