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clang: Treat ieee mode as the default for denormal-fp-math
The IR hasn't switched the default yet, so explicitly add the ieee attributes. I'm still not really sure how the target default denormal mode should interact with -fno-unsafe-math-optimizations. The target may have selected the default mode to be non-IEEE based on the flags or based on its true behavior, but we don't know which is the case. Since the only users of a non-IEEE mode without a flag still support IEEE mode, just reset to IEEE.
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