[Bug rtl-optimization/91347] [7/8/9/10 Regression] pointer_string in linux vsprintf.c is miscompiled when sibling calls are optimized

[dave.anglin at bell dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91347

--- Comment #4 from dave.anglin at bell dot net ---
If DSE bug can't be fixed, the attached patch appears to work around the issue
by disabling
tail calls on pa when an argument is passed on stack.