[Hexagon] Add a case to BitTracker for new register class (#128580) Code in the HexagonBitTracker checks for a specific register class when processing sub-registers. A crash occurred due to a register class that was not handled. The register class is DoubleRegs_with_isub_hi_in_IntRegsLow8RegClassID, which is a class formed by creating a register pair when one of the sub registers is a Low8 integer register. Fixes #128078 Patch by: Brendon Cahoon
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