[bug] group_size = 64 has bug

只修改这两行代码，LLaMa-2-7B 模型无法得到正确的输出。
` Generate<64, Ops>(kernels_); group_sizes_.push_back(64);`

FP16 的输出：
@Input:
The first time I saw the movie, I was like, 'Oh my God,
_Output:
this is so cool.' I was like,

INT4 GroupSize 64 的输出：
@Input:
The first time I saw the movie, I was like, 'Oh my God,
_Output:
I was a little, I was a little