[Bug rtl-optimization/122274] Prevent copy propagation from a non-frame related insn to a frame related insn

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122274

--- Comment #5 from Jeffrey A. Law <law at gcc dot gnu.org> ---
WRT c#2, I concur with Segher and Surya.  Once regcprop does its job we lose
track of the fact we're mucking around the LR.  There's no reasonable way for
the CFI bits to recover that information once we do the propagation and delete
insn 44.