[Inductor] apply vec float mask on logical comparison ops in cpp (#96502)
Fix https://github.com/pytorch/pytorch/issues/96446
The root cause is that the logical comparison op works on the integer vector which is later used in the `where` op that expects a float vector.
1. Make sure float vec mask is applied on logical comparison ops.
2. Fix vec int specialization for `to_float_mask`. Assume int mask as input and returns the float mask with reinterpret cast.
3. Add a no-op specialization for `to_float_mask` function with the float vec as input.
4. Pass value instead of ref to `to_float_mask`. Passing by value should be efficient enough.
5. Remove a conditional check `!=0` in `masked()` since `to_float_mask` is guaranteed to return a float mask.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/96502
Approved by: https://github.com/EikanWang, https://github.com/XiaobingSuper, https://github.com/jansel
