Re: [COMMITTED] Fixup dropping REG_EQUAL note in ext-dce

[Jeff Law]

On 6/23/25 5:28 PM, Sam James wrote:

Followup to r16-1613-g34e1e5e33ec3eb. remove_reg_equal_equiv_notes's
2nd argument is 'no_rescan' which we accidentally had on, tripping
an assert in combine or ira because we hadn't left things in a consistent
state.

Fix the thinko by enabling rescanning.

gcc/ChangeLog:
        PR rtl-optimization/120795

        * ext-dce.cc (ext_dce_try_optimize_insn): Enable rescan in
        remove_reg_equal_equiv_notes call.

Thanks a ton Sam!

Jeff