[PATCH] Added CXXMethodDecl matcher isPureVirtual()

[Konrad Kleine]

Hi,

I've added a new CXXMethodDecl matcher: isPureVirtual().

The isPureVirtual() CXXMethodDecl matcher matches any purely virtual
method declaration like "A::x" in this example:

   class A {
      virtual void x() = 0;
   }

The new matcher is also covered with a positive and negative unittest.

I also fixed a small documentation error (missing semicolon).

Please, see the attachment for a patch.

Regards,
Konrad
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