[clang] [CIR][RISCV] Support vector buitlins codegen (PR #199889)

[Brandon Wu via cfe-commits]

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@@ -405,6 +405,51 @@ mlir::Type CIRGenTypes::convertType(QualType type) {
                                         /*is_scalable=*/true);
       break;
 
+// RISC-V vector types.
+#define RVV_VECTOR_TYPE_INT(Name, Id, SingletonId, NumEls, ElBits, NF,         \
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4vtomat wrote:

Should we handle `NF` here? Or this is a TODO item😂

https://github.com/llvm/llvm-project/pull/199889