Sam ElliottandMitch Briles
99001e3254
Fixes #233318 Before this change, we were restoring some callee-saved registers twice when using save/restore libcalls with shadow call stack (SCS), and the second restore was happening after the stack was deallocated using the wrong register and offset calculation, which was causing lots of access problems. The problems were: - We were using the entire list of Callee Saves rather than just the subset that would have been restored by the libcall. This caused duplicate restores because of how the CSI subsetting works. - We were not using the correct offset calculation in eliminateFrameIndex, which was causing us to calculate the wrong address for the saves/restores. Assisted-by: AI Co-authored-by: Mitch Briles <mitchbriles@gmail.com>
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