[Issue 22074] importC: Generate tests for stressing CParser using Csmith

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22074

--- Comment #2 from Iain Buclaw <ibuclaw at gdcproject.org> ---
(In reply to Walter Bright from comment #1)
> I don't understand. int32_t is a typedef defined by stdint.h, it is not a
> keyword and is not known to ImportC without the typedef.
There is not specific failing example here.

Any errors found by Csmith will have to be Creduce'd.  The actual error message
I posted is from a large source file generated by a fuzzer.

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