RFT: Fix PR middle/end-40154

[joern.renne...@embecosm.com]

This fixes the problem on the Epiphany, but I haven't tested if it also fixes 
it on
the SH - AAUI you'd have to back out a workaround first to properly test it.

Bootstrapped powerpc64-unknown-linux-gnu.

pr40154-fix
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