[Bug target/116621] [12/13/14/15 Regression] x86_64: Crash when fetching va_arg of type union

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116621

H.J. Lu <hjl.tools at gmail dot com> changed:

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--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 59055
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59055&action=edit
A patch

Try this.