[clang] [clang][RISCV] Extend intrinsic size check variable from 16 -> 32 bits. NFC (PR #111481)

[Pengcheng Wang via cfe-commits]

wangpc-pp wrote:

> Why don’t any of our lit tests that use every intrinsic catch it?

We don't see any error, is it because your downstream added some intrinsics?

https://github.com/llvm/llvm-project/pull/111481