[clang] [llvm] [RISCV] Add Smdbltrp and Ssdbltrp extension (PR #111837)

[Yingwei Zheng via cfe-commits]

dtcxzyw wrote:

> Failed Tests (2):
  Clang :: Driver/print-supported-extensions-riscv.c
  Clang :: Preprocessor/riscv-target-features.c

https://github.com/llvm/llvm-project/pull/111837