[Bug target/69299] [6 Regression] -mavx performance degradation with r232088

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69299

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

           What    |Removed                     |Added
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  Attachment #37364|0                           |1
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--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 37372
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37372&action=edit
An updated patch

This patch also changes LRA to skip bad MEM.  Although there are no
regressions on x86-64, there could be latent issues.  Someone should
exam IRA/LRA to see if it is OK.