[Bug rtl-optimization/66890] function splitting only works with profile feedback

[andi-gcc at firstfloor dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66890

--- Comment #4 from Andi Kleen <andi-gcc at firstfloor dot org> ---
Created attachment 36008
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36008&action=edit
Updated patch with documentation and param

I updated the patch with proper documentation and a param for the cut off.
In some tests it appears to do the right thing when building a Linux kernel.