[3.12] gh-104736: Fix test_gdb tests on ppc64le with clang (GH-109360) #109361
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Fix test_gdb on Python built with LLVM clang 16 on Linux ppc64le (ex:
Fedora 38). Search patterns in gdb "bt" command output to detect
when gdb fails to retrieve the traceback. For example, skip a test if
"Backtrace stopped: frame did not save the PC" is found.
(cherry picked from commit 44d9a71)
Co-authored-by: Victor Stinner vstinner@python.org