[RISCV] Make the order of tests in riscv-target-features.c eqaul to the extensions listed in the table in RISCVISAInfo.cpp. NFC.

1. Let the order of tests equal to listed in the extension table in RISCVISAInfo.cpp.
2. Separate non-experimental and experimental extensions.
3. Add missing tests for RV32.
4. Add missing tests for some extension.
5. Let line break style be the same.

Author: tclin914