[Bug lto/70955] [6/7 Regression] Wrong code generation for __builtin_ms_va_list with -flto

[steven.shi at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70955

--- Comment #21 from Steven Shi <steven.shi at intel dot com> ---
Vries,
Sorry, my bad. I didn't apply your patch completely. Yes, your patch works.
And with your patch, my UEFU firmware gcc lto build pass and boot successfully.
Hope we could check in a formal fix ASAP, because the lto build is Uefi
firmware GCC default build now. This regression bug block us to adopt new
version GCC on Uefi firmware. Thanks!