Be more specific about OOM in XLogReaderAllocate

A couple of spots can benefit from an added errdetail(), which matches
what we were already doing in other places; and those that cannot
withstand errdetail() can get a more descriptive primary message.

Author: Bharath Rupireddy <[email protected]>
Reviewed-by: Daniel Gustafsson <[email protected]>
Reviewed-by: Julien Rouhaud <[email protected]>
Discussion: 
https://postgr.es/m/CALj2ACV+cX1eM03GfcA=zmlxh5fsn1x1aujlz3yus1dupsb...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/2fed48f48f7f2f7a6d6f6d020f046efe3c249828

Modified Files
--------------
src/backend/access/transam/xlog.c         | 2 +-
src/backend/replication/logical/logical.c | 3 ++-
src/backend/replication/walsender.c       | 3 ++-
src/bin/pg_rewind/parsexlog.c             | 6 +++---
src/bin/pg_waldump/pg_waldump.c           | 2 +-
5 files changed, 9 insertions(+), 7 deletions(-)

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