Support reading registers r0-r3 when unwinding. There is a seperate instruction to load these. We only hit it when unwinding past an trap frame as in C r0-r3 would never have been saved onto the stack.
Support reading registers r0-r3 when unwinding. There is a seperate
instruction to load these. We only hit it when unwinding past an trap frame
as in C r0-r3 would never have been saved onto the stack.

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