https://issues.dlang.org/show_bug.cgi?id=22806

          Issue ID: 22806
           Summary: cppmangle: Complex real mangled incorrectly
           Product: D
           Version: D2
          Hardware: PowerPC
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: ibuclaw@gdcproject.org

On PPC64, `real` could either be mapped to a C `long double` or a `__float128` type.

The former uses the IBM 128-bit, and is mangled as 'g', the latter is IEEE 128-bit, and is mangled as 'u9__ieee128'.

Both are not correctly accounted for in neither TypeEnum (special types), nor
TypeBasic (complex types).

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