Add Zilsd/Zclsd support

[trdthg]

Description

rebase on #467. Compared to the original PR, I only modified a little isa constraints in cgf and generate tests again, so coverage should be fine. Test use RV32ICZilsd_Zclsd All test passed

Sail PR riscv/sail-riscv#765

Since zilsd/zclsd currently has no gcc support, I tested it with the gcc/binutils from nxp (the original PR seems to use clang).

Related Issues

NA

Ratified/Unratified Extensions

• Ratified
• Unratified

List Extensions

List the extensions that your PR affects. In case of unratified extensions, please provide a link to the spec draft that was referred to make this PR.

Reference Model Used

• SAIL
• Spike
• Other - < SPECIFY HERE >

Mandatory Checklist:

• All tests are compliant with the test-format spec present in this repo ?
• Ran the new tests on RISCOF with SAIL/Spike as reference model successfully ?
• Ran the new tests on RISCOF in coverage mode
• Link to Google-Drive folder containing the new coverage reports (See this for more info): < SPECIFY HERE >

Optional Checklist:

• Were the tests hand-written/modified ?
• Have you run these on any hard DUT model ? Please specify name and provide link if possible in the description
• If you have modified arch_test.h Please provide a detailed description of the changes in the Description section above.