Use extracted LEB128 implementation from Packed_locs
Use extracted LEB128 implementation from Packed_locs

Summary:
Previous diff in stack extracted this logic with tests, while fixing a bug.
Using the extracted logic means that this module now has the bug fix.

Reviewed By: panagosg7

Differential Revision: D29106359

fbshipit-source-id: 85693ebad4d3b4ecfaae10cbdfd7dc4001689fa6

mroch/flow,facebook/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow,mroch/flow,mroch/flow,mroch/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow