disable tpp for un-verified models

[jiqing-feng]

Fix #810

Hi @echarlaix . The tpp is only verified for llm in generation tasks, it may have some error when enabling it for a normal model like:

model = IPEXModel.from_pretrained('sentence-transformers/all-MiniLM-L6-v2', export=True)

The error will be:

free(): invalid pointer
free(): corrupted unsorted chunks                                                                                                                                                                            
LIBXSMM_VERSION: unconfigured (2147483647)
SPR/SP      TRY    JIT    STA    COL
   0..13      4      4      0      0
  14..23      0      0      0      0
  24..64     24     24      0      0                                                                                                                                                                         Registry and code: 13 MB + 336 KB (gemm=28 gemv=4 meltw=10)
Command: python tpp_bert.py
Uptime: 0.098529 s
Aborted (core dumped)

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