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The .note.gnu.property must be in the assembly file to indicate the support for BTI otherwise BTI will be disabled for the whole library. __unw_getcontext and libunwind::Registers_arm64::jumpto() may be called indirectly therefore they should start with a landing pad. Reviewed By: tamas.petz, #libunwind, compnerd Differential Revision: https://reviews.llvm.org/D77786