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[ARM] Implement harden-sls-retbr for Thumb mode

Authored by kristof.beyls on Dec 1 2020, 8:21 AM.



The only non-trivial consideration in this patch is that the formation
of TBB/TBH instructions, which is done in the constant island pass, does
not understand the speculation barriers inserted by the SLSHardening
pass. As such, when harden-sls-retbr is enabled for a function, the
formation of TBB/TBH instructions in the constant island pass is

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Event Timeline

kristof.beyls created this revision.Dec 1 2020, 8:21 AM
This revision is now accepted and ready to land.Dec 17 2020, 1:47 AM
This revision was landed with ongoing or failed builds.Dec 19 2020, 4:33 AM
This revision was automatically updated to reflect the committed changes.