[Bug target/70064] Wrong code with custom flags and quite big testcase @ i686

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70064

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
I think -mred-zone should be disallowed in 32-bit to avoid any potential
issues.