Fixed being able to set breakpoints on destructors when we don't fully specify...

Fixed being able to set breakpoints on destructors when we don't fully specify the demangled name. So all of the following now work:

(lldb) b ~Foo
(lldb) b Foo::~Foo
(lldb) b Bar::Foo::~Foo

Improved out C++ breakpoint locations tests as well to cover this issue.

<rdar://problem/25577252>

llvm-svn: 266139