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Brad King authored
We now identify IBM's Clang-based XL compilers, which define `__ibmxl__`, as `XLClang` rather than `XL`. In order to support existing project code that checks for `XL`, add a policy whose OLD behavior is to present the compiler id as `XL` and whose NEW behavior is to present the compiler id as `XLClang` as we really detect it.
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