Add fault model to support FI into DNN's weights and biases

[uditagarwal97]

It would be interesting to add an additional fault model in LLTFI for injecting bit flips into the weights and the biases of the Ml application.

This would require us to write an LLVM pass to add bitflips in the statically-stored parameter weights and biases from the input ML model's LLVM IR file.