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f4cf404837
Support headers shouldn't use config.h definitions, and they should never be undefined like this. ConstantFolding.cpp was the only user of this facility and already includes config.h for other math features, so it makes sense to move the checks there at point of use. (The implicit config.h was also quite dangerous -- removing the FEnv.h include would have silently disabled math constant folding without causing any tests to fail. Need to investigate -Wundef once the cleanup is done.) This eliminates the last config.h include from LLVM headers, paving the way for more consistent configuration checks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210483 91177308-0d34-0410-b5e6-96231b3b80d8
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