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When building with -mbranch-protection=bti, which affects the compiler codegen only, ensure that the assembler based codegen is aligned with this, by emitting the BTI C opcode at the start of each exported function. While most exported functions are not in fact ever called indirectly, whether or not this is the case is a property of the caller so annotating every exported function is a reasonable default. While at it, fix two occurrences in ArmPkg of exported functions that did not use the ASM_FUNC() macro. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com> Reviewed-by: Oliver Smith-Denny <osd@smith-denny.com>