To do: Softmax masking should be optimized

[andrej]

IRON/aie_kernels/aie2p/softmax.cc

Lines 180 to 186 in 2b62dc7

	void mask_bf16(bfloat16 *inout, const int32 unmasked_size, const int32 total_size)
	{
	// TODO: Optimize this to use vector code
	for (int32 i = unmasked_size; i < total_size; i++) {
	inout[i] = (bfloat16)(-INFINITY);
	}
	}