[Bug 1907298] Re: glibc 2.32-0ubuntu5 ADT test failure with linux 5.10.0-7.8

[Seth Forshee]

Reverting "powerpc/64/signal: Balance return predictor stack in signal
trampoline" gets the test passing, so that does appear to be the cause.
I'm not sure what needs to happen here to resolve the test failure
though.

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Title:
  glibc 2.32-0ubuntu5 ADT test failure with linux 5.10.0-7.8

Status in glibc package in Ubuntu:
  New

Bug description:
  Testing failed on:
      ppc64el: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-hirsute-canonical-kernel-team-bootstrap/hirsute/ppc64el/g/glibc/20201208_192946_04f11@/log.gz

  ----------
  FAIL: misc/tst-sigcontext-get_pc
  original exit status 1
  info: address in signal handler: 0x737faa11db44
  info: call stack entry 0: 0x737faa311f58
  info: call stack entry 1: 0x737faa3404c4
  info: call stack entry 2: 0x0
  info: call stack entry 3: 0x737faa312144
  info: call stack entry 4: 0x737faa312870
  info: call stack entry 5: 0x737faa313264
  info: call stack entry 6: 0x737faa311c40
  info: call stack entry 7: 0x737faa0f9e5c
  info: call stack entry 8: 0x737faa0fa040
  error: ../sysdeps/unix/sysv/linux/tst-sigcontext-get_pc.c:60: not true: found
  error: 1 test failures
  ----------

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