[Bug go/66870] split stack issues on ppc64le and ppc64

[boger at us dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66870

--- Comment #15 from boger at us dot ibm.com ---
I have submitted my patch to gcc-patches to check for the no_split_stack
attribute after revising it based on Alan's comments.