Split functions from their declarations

This splits occurrences of functions from their declaration. This is
necessary to flag integer functions consistently and not just single
occurrences.

src/anthem/ASTCopy.cpp

@@ -105,7 +105,7 @@ Comparison prepareCopy(const Comparison &other)
 
 Function prepareCopy(const Function &other)
 {
-	return Function(std::string(other.name), prepareCopy(other.arguments));
+	return Function(other.declaration, prepareCopy(other.arguments));
 }
 
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