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[tree-ssa] build failure on powerpc-aix in libobjc


On powerpc-aix (this was reported to me from David Edelsohn),
isdigit is not a macro so fold_builtin is folding isdigit and
it causes an ICE.  Since the folding of isdigit is new, it
looks like it does check if we are able to create non
gimple which it happens here.


Here is the simple testcase: int isdigit (int); int objc_skip_offset (const char *type) { return isdigit ((unsigned char) *type++); }

Thanks,
Andrew Pinski


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