Zero out the padding bytes when packing arguments in the JIT runtime. We were zero'ing out padding bits in the most-significant byte of actual data, but neglected to zero out the extra _bytes_ for the power-of-two padding used by the jit.
Zero out the padding bytes when packing arguments in the JIT runtime.
We were zero'ing out padding bits in the most-significant byte of actual data, but neglected to zero out the extra _bytes_ for the power-of-two padding used by the jit.

PiperOrigin-RevId: 480732601

google/xls,google/xls,google/xls,google/xls,google/xls,google/xls