Test case compact_share fails with NCG with optimizations

Summary

Similar to #21978, #21977, etc., this test case works without optimizations, but fails when using any optimization level (such as with --test-way=optasm), because it prints a different size.

Steps to reproduce

~/myghc/ghc/_build/stage1/bin/ghc compact_share.hs && ./compact_share

prints

411963

5177344

411963

2686976

as in compact_share.stdout-ws-64

But with optimizations -O:

~/myghc/ghc/_build/stage1/bin/ghc -O compact_share.hs && ./compact_share

prints

411963

5308416

411963

2686976

See second number.

Expected behavior

I assume it should print the same value, otherwise, can the test case be adapted as not to fail using the optasm way?

Environment

• GHC version used: main HEAD

Optional:

• Operating System: Ubuntu Linux 20.04
• System Architecture: x86_64