[Bug target/91767] After r274953, clang-compiled xgcc segfaults during RTL pass: stv

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91767

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
If anything, one of the general_scalar_chain objects is not being constructed
correctly.

That is:
hash_map<rtx, rtx> defs_map;
not being done correctly.