[MS Demangler] Add rudimentary C++11 Support
This patch adds support for demangling r-value references, new
operators such as the ""_foo operator, lambdas, alias types,
nullptr_t, and various other C++11'isms.
There is 1 failing test remaining in this file, which appears to
be related to back-referencing. This type of problem has the
potential to get ugly so I'd rather fix it in a separate patch.
Differential Revision: https://reviews.llvm.org/D50013
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338324
91177308-0d34-0410-b5e6-
96231b3b80d8
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