Only show MPS Compile Warning if compile is attempted

[Jack-Khuu]

No Compile, No Warning

python torchchat.py generate llama3.1
Using device=mps
Loading model...
Time to load model: 10.68 seconds
-----------------------------------------------------------

With compile, with Warning

python torchchat.py generate llama3.1 --compile
Warning: compilation is not available with device MPS, ignoring option to engage compilation
Using device=mps
Loading model...
Time to load model: 11.98 seconds
-----------------------------------------------------------

[pytorch-bot]

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As of commit 92f5f56 with merge base 0ddee99 ():
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