Revert "Enable logf128 constant folding for hosts with 128bit long double (#104929)" ConstantFolding behaves differently depending on host's `HAS_IEE754_FLOAT128`. LLVM should not change the behavior depending on host configurations. This reverts commit 14c7e4a1844904f3db9b2dc93b722925a8c66b27. (llvmorg-20-init-3262-g14c7e4a18449 and llvmorg-20-init-3498-g001e423ac626)
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