Broadcasting issues with scalars

[jansel]

@triton.jit
def kernel0(out_ptr2, xnumel, XBLOCK : tl.constexpr):
    xoffset = tl.program_id(0) * XBLOCK
    xindex = xoffset + tl.reshape(tl.arange(0, XBLOCK), [XBLOCK, 1])
    xmask = xindex < xnumel
    tmp6 = 1.0

    # this version works
    # tl.store(out_ptr2, tmp6)

    # this version: AttributeError: 'pointer_type' object has no attribute 'get_block_shapes'
    tl.store(out_ptr2, tmp6, xmask)


kernel0(..., numel=1, XBLOCK=1)

We were hitting some errors related to single element writes at the end of a reduction. In this case the mask is a bit pointless ([[True]]), but we need to generate workarounds for this.