ggml-hexagon: fix swiglu failure at `test-backend-ops` (llama/17344)

ggml-hexagon: fix swiglu failure at `test-backend-ops` (llama/17344)

* refactor: use hvx_vec_exp_fp32_guard_inf for overflow handling in hvx_exp_f32

* feat: add fast sigmoid function with overflow guard for fp32

* refactor: replace hvx_vec_inverse_fp32 with hvx_vec_inverse_fp32_guard_inf for improved overflow handling

* feat: enhance hvx_add_scalar_f32 with overflow handling using infinity guard

* wip

* add HVX_Vector_Alias

wip

* wip

* fix: improve handling of src1 tensor in glu_swiglu_fp32_per_thread function

* fix nc

* wip

* wip

* handle nan at inverse

* wip

* fix neg

* wip

* rename

* fix hvx_vec_inverse_fp32_guard_inf to handle infinity and NaN cases correctly

* wip

* fix hvx_vec_inverse_fp32_guard_inf to handle NaN cases correctly

* wip

* wip

* wip

* fix output sign