[CHERIOT] Add a TTI callback to disallow LSR base register expressions. #184
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This allows us to turn on SCEV for cheriot, with the caveat that we need to disallow LSR base register expressions that are negatively indexed, since they may not be representable on cheriot.
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This allows us to turn on SCEV for cheriot, with the caveat that we need
to disallow LSR base register expressions that are negatively indexed, since
they may not be representable on cheriot.