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Previously this was based on target architecture, but that makes very little sense--frame API availability is generally for libgcc compatibility and that is dependent on runtime needs rather than target architecture. Default this to on, so as not to remove the apis from environments that already have them. The functions this macro protects are stubs for libgcc-compatibility. Today, libunwind as a drop-in replacement for libgcc_eh links on x86, x86_64, and powerpc, but not aarch64, which doesn't really make sense. As there is nothing architecture specific about these, they should be provided everywhere or nowhere. The target-specific protection goes all the way back to the original code contribution in 312fcd0e1cf14482b2ae8eee8234541dcc3bc2c4 from 2013, so the original reason is lost to history, and probably not relevant today. Differential Revision: https://reviews.llvm.org/D158011