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This is so when a debugger attaches using MPIR, it can step out of this stack back into main. This cannot be done with certain aggressive optimisations and missing debug information. Signed-off-by: James Clark <james.clark@arm.com> Signed-off-by: Jeff Squyres <jsquyres@cisco.com> Co-authored-by: Jeff Squyres <jsquyres@cisco.com>