@ABataev , could you please commit this patch because I don't have commit access yet?
My git user name and email address: Yuichiro Utsumi (utsumi.yuichiro@fujitsu.com)

add a clang unit test

Sorry for the late reply.
I found that the problem this patch intended to fix was fixed by https://reviews.llvm.org/D87771 .

Ping.

After my colleague modified llvm/lib/CodeGen/CalcSpillWeights.cpp for the register allocator in the LLVM 7 based compiler, he faced the Segmentation fault when executing a program.
As a result of an investigation, we found that the modification for the register allocator is not bad, and this fix is needed.
The above modification for the register allocator cannot be applied to the current main branch straightly, and cannot be published because that modification is in our product code.

@dmgreen No. I don't have ll file or C/C++ code now.

@kawashima-fj Thanks. LGTM.

Thank you very much. LGTM.

LGTM