[cfe-dev] patch for generalizing stdint for n-bit bytes

[Ray Fix]

Hello Clangers,

The attached patch is the work of Ken Dyck which I merged and massaged  
a bit to work with the top of the tree (R84372).   This patch  
generalizes some of the defines produced by the preprocessor in  
preparation for future patches to support of n-bit bytes.

Some other highlights include the addition of 40 new test cases that  
help better validate the preprocessor and target defines.  It also  
gets rid of std::vector<char> in favor of llvm::raw_ostream to create  
defines.

My hope is that someone with commit authority can look these changes  
and approve them or provide feedback for any additional mods work that  
is required for them to be accepted.

Since the patch is a bit large (thanks to all of the new tests!), I am  
including a custom htmlized view of the patch.  (You might find it  
easier to grok the changes with...)

Thanks a bunch,

Ray

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