tt::runtime::Binary::asJson() crashes in some cases.

[LPanosTT]

In the op-by-op flow, tt::runtime::Binary::asJson() will segfault in some cases (more often than not in some tests). The reason is unknown. If the following test is run you will encounter the segfault:

pytest -svv tests/models/llama/test_llama.py --op_by_op

The crash is currently silent in main as the call to asJson was moved to a function which is called in the compile process. Checkout a previous commit to have the segfault halt the main process: d27990dfc4f823cabada285615a91627c0b0ed99