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From: "iii at linux dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/97866] [11 Regression] bootstrap error in libasan
 building a s390x-linux-gnu cross compiler
Date: Tue, 17 Nov 2020 20:15:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97866

--- Comment #3 from Ilya Leoshkevich <iii at linux dot ibm.com> ---
I believe it's already fixed by:

commit 253c415a1acba50711c82693426391743ac18040
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date:   Sun Nov 15 11:22:19 2020 -0500

    Do not put reload insns in the last empty BB.

    gcc/
            * lra.c (lra_process_new_insns): Don't put reload insns in the
            last empty BB.

Cherry-picking it helps, and the comment from this commit describes what is
happening here: "Do not put reload insns if it is the last BB without actual
insns.  In this case the reload insns can get null BB after emitting".=