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

[Brandon Wu via cfe-commits]

4vtomat wrote:

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

Somehow if we add more "target-feature" the intrinsics increase, I'm not sure why.
For example:
```
test.c

#include "riscv_vector.h"
  vfloat16mf4x7_t test_vlseg7e16ff_v_f16mf4x7(const _Float16 *base, size_t *new_vl, size_t vl) {
  return __riscv_vlseg7e16ff_v_f16mf4x7(base, new_vl, vl);
}
```
Compile with this command:
```
clang -cc1 -triple riscv64-- -S -target-feature +v -target-feature +zvfh -target-abi lp64d test.c
```
generate 61674 intrinsics.
However if we add `-target-feature +zvfbfmin`
```
clang -cc1 -triple riscv64-- -S -target-feature +v -target-feature +zvfh -target-feature +zvfbfmin -target-abi lp64d test.c
```
generate 64568 intrinsics

it's weird.

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