Unroll warp-specialized loops

[zasdfgbnm]

When used with #3545, this contribute a speedup of 5% of cuBLAS!

Perf together with #3545 on H100:

 Time (%)  Total Time (ns)  Instances  Avg (ns)  Med (ns)  Min (ns)  Max (ns)  StdDev (ns)                                                  Name

 --------  ---------------  ---------  --------  --------  --------  --------  -----------  ----------------------------------------------------------------------------------------------------
     33.8           136319          1  136319.0  136319.0    136319    136319          0.0  <unnamed>::nvfuser_none_f0_c0_r0_g0(<unnamed>::Tensor<<unnamed>::__half, (int)3, (int)3>, <unnamed>…
     22.7            91487          1   91487.0   91487.0     91487     91487          0.0  nvjet_hsh_128x256_64x4_2x1_v_bz_coopA_NTN

nvFuser/cuBLAS: 67%

Note that the above test is run with smem epilogue disabled. I will run a test with everything combined later. Also note that this number is on H100, which is different from the H200 in #3279.

[zasdfgbnm]

!test

[naoyam]

LGTM