Add unratified Svrsw60t59b extension tests

[ved-rivos]

Description

Add tests for Svrsw60t59b extension. A test macro was added for the test that sets the RSW bits 60:59 to the four possible values.

riscv-config: riscv-software-src/riscv-config#195
Spike: riscv-software-src/riscv-isa-sim#1936
Sail: riscv/sail-riscv#797

Related Issues

NA

Ratified/Unratified Extensions

• Ratified
• Unratified

List Extensions

riscv/riscv-isa-manual#1907

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 ? Yes
• 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.