CI: Provide release flags, exclude -march=native

[Shaikh-Ubaid]

I think we just need to lower the optimization options, perhaps keep -O3, but remove -march=native or something like that.

towards #2162 (comment)

[Shaikh-Ubaid]

I am unsure if the changes in this PR are the perfect fix. This seems to be more of an experimental PR. I think we can later try other steps/approaches if the failure in Release build is still experienced post merging of this PR.

[czgdp1807]

So -O3 optimisations weren't applied in the release build before this PR?

[Shaikh-Ubaid]

So -O3 optimisations weren't applied in the release build before this PR?

I think they were being applied.

lpython/cmake/UserOverride.cmake

Line 12 in 634177d

set(CMAKE_CXX_FLAGS_RELEASE_INIT "${common} -O3 -march=native -funroll-loops -DNDEBUG")

In this PR, I just excluded the -march=native flag.

[certik]

Yes, let's try this and see.