[Bug target/121540] [16 Regression] MMX is allowed in function with no_caller_saved_registers attribute

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121540

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 62117
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62117&action=edit
A patch

I am testing this.