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This change consists of just adding 'BTI' to the prologue of Arm assembly functions, which is just the one: __cxa_end_cleanup This patch is part of a series that adds support for the PACBTI-M extension of the Armv8.1-M architecture, as detailed here: https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/armv8-1-m-pointer-authentication-and-branch-target-identification-extension The PACBTI-M specification can be found in the Armv8-M Architecture Reference Manual: https://developer.arm.com/documentation/ddi0553/latest The following people contributed to this patch: - Mikhail Maltsev Reviewed By: lenary, danielkiss Differential Revision: https://reviews.llvm.org/D112432