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LLVM21 fixed the new float types on a number of targets: * SystemZ gained f16 support https://github.com/llvm/llvm-project/pull/109164 * Hexagon now uses soft f16 to avoid recursion bugs https://github.com/llvm/llvm-project/pull/130977 * Mips now correctly handles f128 (actually since LLVM20) https://github.com/llvm/llvm-project/pull/117525 * f128 is now correctly aligned when passing the stack on x86 https://github.com/llvm/llvm-project/pull/138092 Thus, enable the types on relevant targets for LLVM > 21.0.0. NVPTX also gained handling of f128 as a storage type, but it lacks support for basic math operations so is still disabled here.