tarantool / tarantool / 18842365793 / 1

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xlog: panic on runtime memory OOM

Particularly this fixes Coverity report
https://scan7.scan.coverity.com/#/project-view/43693/13437?selectedIssue=1666686
for recently added unchecked allocation in `xlog_cursor_read_tx()`.

NO_TEST=we don't test runtime memory OOM
NO_CHANGELOG=not yet released
NO_DOC=bugfix

69957 of 117821 branches covered (59.38%)

105061 of 119864 relevant lines covered (87.65%)

1349063.42 hits per line