[Bug target/87007] [8 Regression] 10% slowdown with -march=skylake-avx512

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87007
Bug 87007 depends on bug 89474, which changed state.

Bug 89474 Summary: [9 Regression] ice in df_reg_chain_verify_unmarked, at 
df-scan.c:3995
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89474

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED