Allow model builder to build a model based on a file descriptor.
Allow model builder to build a model based on a file descriptor.

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/13065 from kaixih:disable_bias_reuse_in_fp8 15f774667013045c7d8d9e38ac80a45645313b1e
