[cfe-dev] [PATCH] Missing calls for #elif PPCallback.

[Enea Zaffanella]

Hello.

It seems that the #elif preprocessor callback is not called in code such 
as the following, where the #if condition evaluates to false:

#if UNDEF
#elif DEF
#endif

The attached patch fixes it.
Also added a testcase.

Enea.
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