[llvm] [test][BPF] Remove unsafe-fp-math uses (NFC) (PR #164784)

[via llvm-commits]

eddyz87 wrote:

As a collateral this commit also removes lots of `nounwind`, `readnone` and `speculatable` attributes. For tests in `BTF/` and `CORE/` sub-directories this should not matter. I reviewed the remaining modified tests and none of them seem to depend on the above mentioned attributes.

@yonghong-song , could you please skim through the test file names, in case you remember that some of them does depend on these attributes?

Otherwise, I think the change is fine.

https://github.com/llvm/llvm-project/pull/164784