Fix calls to sizes to enable dynamic shapes with sdpa (#96674)
Fixes part of #96414
Replaces any calls to sizes, with sym_sizes. Still seeing an error with the repro script:
``` Bash
Exception raised from sizes_default at /scratch/drisspg/work/pytorch/c10/core/TensorImpl.h:635 (most recent call first):
frame #0: c10::Error::Error(c10::SourceLocation, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) + 0x7d (0x7f697f4a141d in /scratch/drisspg/work/pytorch/torch/lib/libc10.so)
frame #1: c10::detail::torchCheckFail(char const*, char const*, unsigned int, char const*) + 0xdd (0x7f697f49fbcd in /scratch/drisspg/work/pytorch/torch/lib/libc10.so)
frame #2: c10::TensorImpl::sizes_custom() const + 0x95 (0x7f697f4824c5 in /scratch/drisspg/work/pytorch/torch/lib/libc10.so)
frame #3: at::native::empty_like(at::Tensor const&, c10::optional<c10::ScalarType>, c10::optional<c10::Layout>, c10::optional<c10::Device>, c10::optional<bool>, c10::optional<c10::MemoryFormat>) + 0x92c (0x7f69809d18ac in /scratch/drisspg/work/pytorch/torch/lib/libtorch_cpu.so)
frame #4: <unknown function> + 0x23f5ce7 (0x7f698193bce7 in /scratch/drisspg/work/pytorch/torch/lib/libtorch_cpu.so)
```
still trying to track down this empty call
from the looks of it, might be coming from at::layer_norm?
the BT from lldb is 221 frames however, so lots of noise
Pull Request resolved: https://github.com/pytorch/pytorch/pull/96674
Approved by: https://github.com/ezyang
