yarpgen support pragma omp simd

I used the Yargen tool and found a bug in the tool.

wrong code：
void test(int *acc, int *inc) {
#pragma omp simd
for (int i = 0; i < 16; i++)
*acc += *inc;
}

OK code：
void test(int *acc, int *inc) {
#pragma omp simd reduction(+:acc[0])
for (int i = 0; i < 16; i++)
*acc += *inc;
}
The absence of the "reduction" keyword leads to undefined behavior in this test case.

Who knows how to solve this problem?