[cfe-dev] Fix PR13444 - wrong mangling of "const char * const *" and friends

[Timur Iskhodzhanov]

Hi John,

Can you please review this patch?
This fixes http://llvm.org/PR13444 as well as a large part of
http://llvm.org/PR13182 plus adds quite a few tests.

With this patch plus the pending PR13455 patch I don't get link-time
problems when building SPEC CPU2006 tests anymore!
(I'm only testing the files that are compileable with Clang++ though,
e.g. no RTTI users etc)

FTR, the SplitQualType / isa<ArrayType> part was mostly taken from
ItaniumMangle.cpp

Thanks in advance,
Timur Iskhodzhanov,
Google Russia
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