cmake HAS_LOGF128 examples

Lewuathe/mlir-hello thirdparty/llvm-project/llvm/cmake/config-ix.cmake :288 

check_cxx_symbol_exists(logf128 math.h HAS_LOGF128)

Lewuathe/mlir-hello thirdparty/llvm-project/llvm/lib/Analysis/CMakeLists.txt :169 

check_cxx_symbol_exists(logf128 math.h HAS_LOGF128)

Lewuathe/mlir-hello thirdparty/llvm-project/llvm/lib/Analysis/CMakeLists.txt :171 

target_compile_definitions(LLVMAnalysis PRIVATE HAS_LOGF128)