[Bug target/66749] [4.9/5/6] gcc.target/i386/addr-sel-1.c fails to merge array index into one instruction with -m32 -mregparm=3 or with -miamcu

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66749

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 35904
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35904&action=edit
A patch

Please try this.