[Hexagon] Implement bit-tracking facility with specifics for Hexagon

Description

[Hexagon] Implement bit-tracking facility with specifics for Hexagon

This includes code that is intended to be target-independent as well
as the Hexagon-specific details. This is just the framework without
any users.

Details

Committed
kparzyszJul 7 2015, 8:16 AM
Parents
rL241594: Fix first line comment format, NFC.
Branches
Unknown
Tags
Unknown