Mangling for C++0x ref-qualifier

[Doug Gregor]

We don't yet have a mangling for C++0x ref-qualifiers, e.g.,

  struct X {
    int f() &;
    int g() &&;
    int h() const &&;
  };

I propose that we use 'R' for a & ref-qualifier and 'O' for a &&
ref-qualifier, following the mangling of the cv-qualifiers for the
member function. The attached patch has the specifics.

  - Doug
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