[Bug libgcc/70363] PowerPC __float128 to long double doesn't link if built with an assember without ISA 3.0 support

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70363

--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> ---
Created attachment 38063
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38063&action=edit
Proposed patch to fix the problem