[PATCH] D demangle: Add support for Nj and Nk symbols in mangled string

[Iain Buclaw]

The next version of D introduces two new mangle conventions.

- Nj to represent methods whose 'this' parameter is also the function
return value
- Nk to represent a 'ref' parameter that is also the function return value

This patch introduces support for these two symbols.

---
libiberty/ChangeLog:

2015-05-10 Iain Buclaw  <ibuclaw@gdcproject.org>

    * d-demangle.c (dlang_attributes): Handle Nj and ignore Nk symbol in
    mangled string.  Return NULL if have encountered an unknown attribute.
    (dlang_function_args): Handle Nk symbol in mangled string.
    * testsuite/d-demangle-expected: Add coverage tests for functions with
    return parameters and return attributes.
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