Merge commit 9f85bc834b07 from llvm-project (by Nikita Popov):HEADmain

  [PPCMergeStringPool] Only replace constant once (#92996)

  In #88846 I changed this code to use RAUW to perform the replacement
  instead of manual updates -- but kept the outer loop, which means we try
  to perform RAUW once per user. However, some of the users might be freed
  by the RAUW operation, resulting in use-after-free.

  The case where this happens is constant users where the replacement
  might result in the destruction of the original constant.

  Fixes https://github.com/llvm/llvm-project/issues/92991.

This fixes a possible crash when building crypto/openssh/sshkey.c for
PowerPC targets.

Reported by:	cperciva
PR:		276104
MFC after:	3 days

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