r174576 - Simplify FindExternalVisibleDeclsByName by making it return a bool indicating

[Sean Silva]

   /// \brief Finds all the visible declarations with a given name.
   /// The current implementation of this method just loads the entire
   /// lookup table as unmaterialized references.
-  virtual DeclContext::lookup_result
+  virtual bool

Bool return arguments probably deserve a mention in the comment, due to
their notorious ambiguity.

-- Sean Silva
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