[clang] [RISCV] Support __riscv_v_fixed_vlen for vbool types. (PR #76551)

[Tianlan Zhou via cfe-commits]

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@@ -975,6 +975,8 @@ RISC-V Support
 - Default ABI with F but without D was changed to ilp32f for RV32 and to lp64f
   for RV64.
 
+- ``__attribute__((rvv_vector_bits(N))) is now supported for RVV vbool*_t types.
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SuperSodaSea wrote:

This line breaks the documentation build (missing ending ` `` `).

https://github.com/llvm/llvm-project/pull/76551