Adding knowledge of the int_fastN_t types to the compiler, take 2

[FX]

Hi all,

I've tried to take into account the remarks from Joseph and Ian,  
here's an updated patch. I welcome comments, ideas on how to best add  
testcases in the testsuite (for example, comparing Fortran  
information and C headers). After that, I will submit the complete  
patch + testcases + doc + ChangeLog entries for formal review.

Thanks,
FX



PS: though this is a first step towards implementing a fallback  
stdint.h header file for targets that don't have one, I don't plan to  
do this work; having them available to Fortran is what I am  
interested in :)


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-- 
Fran?ois-Xavier Coudert
http://www.homepages.ucl.ac.uk/~uccafco/