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This is a second attempt to land #84501 which failed on several targets. This patch adds the HAS_IEE754_FLOAT128 define which makes the check for typedef'ing float128 more precise by checking whether __uint128_t is available and checking if the host does not use __ibm128 which is prevalent on power pc targets and replaces IEEE754 float128s.
See docs/CMake.html for instructions on how to build LLVM with CMake.