0d3eee33f2
Support for below CSRs is addeed - 1. Branch Prediction Mode CSR 2. Feature Disable CSR 3. Power Dial CSR 4. RNMI CSRs spec:https://sifive.cdn.prismic.io/sifive/767804da-53b2-4893-97d5-b7c030ae0a94_s76mc_core_complex_manual_21G3.pdf This patch removes AltName field from SysReg class because we are now using separate class for custom vendor CSRs. Also, all use of AltName have been changed to DeprecatedName because both were interchangeably used for old names which are not in use in latest RISCV spec. Reviewed By: craig.topper Differential Revision: https://reviews.llvm.org/D153499