Brad King 5c41386357 XLClang: Add policy CMP0089 to present as XL for compatibility
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.
2019-02-25 08:24:28 -05:00
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