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

[zenith432 at users dot sourceforge.net]

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

--- Comment #10 from zenith432 at users dot sourceforge.net ---
(In reply to vries from comment #8)
> Created attachment 38453 [details]
> tentative patch

vries, thank you very much.  I verified and looks good.

Built GCC 6.1.0 with patch from released sources on ftp.gnu.org.
[moved the patch to the right place of course]

Built a fairly large UEFI-based project with a good number of ms_va_list. 
Checked the disassembly manually for 1 instance.  Code is right + tested it to
run ok in various scenarios I know to use __builtin_va_arg.

Bug can be changed to resolved as far as I'm concerned.  Not sure whether it
has to wait for commit, so leaving it to TPTB.