resources: Add test for RISC-V Zacas extension

[vsoriap]

This PR is based on RISC-V tests PR 492. It adds tests for the Zacas extension. The new tests cover amocas_w and amocas_d for RV32 and amocas_w, amocas_d, and amocas_q for RV64.

[powerjg]

lgtm. Do you know what we need to do (or maybe @Harshil2107) to build these, host them, and make sure they are run in our testing suite?

[vsoriap]

Building: I just executed the make file within the asmtest, and it generated the binaries with the default riscv toolchain.
Hosting: I'm not sure about what the infra behind the gem5-resources. So, maybe @Harshil2107 can clarify.
Running: I've a pull request in gem5 that introduces the amocas instructions (the single register version, not the pair one) and their tests (Check gem5 PR 3499). So, once this PR is merged gem5 would be able to run them.

[vsoriap]

Hi, I've managed to push these tests with some small changes into the riscv-tests riscv-software-src/riscv-tests#662. I will push the most updated version, soon.

[Harshil2107]

Hi @vsoriap, I just looked at the PRs and from looking at the code we just need to upload the new binaries to gem5 resources.

Please let me know if this version is ready and I should make the binaries from the latest commit in this PR and upload them or I should wait. If so please ping me when the PR is ready and I will make and upload these new binaries.