[Bug target/100152] [10/11/12 Regression] used caller-saved register not preserved across a call.

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100152

--- Comment #44 from Iain Sandoe <iains at gcc dot gnu.org> ---
unfortunately, wider testing showed sanitiser fails - so this has been reverted
for now.