Add a workaround to recognise I/_Complex_I as complex arguments.  Although the GCC manual claims that the expression 1.0fi has type float _Complex, __builtin_types_compatible_p(float _Complex, __typeof__(1.0fi))) yields 0.
Add a workaround to recognise I/_Complex_I as complex arguments.  Although
the GCC manual claims that the expression 1.0fi has type float _Complex,
__builtin_types_compatible_p(float _Complex, __typeof__(1.0fi))) yields 0.

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