[PATCH] Exception handling docs: Describe landingpad clauses' meanings in more detail

[Mark Seaborn]

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Comment at: docs/ExceptionHandling.rst:189
@@ +188,3 @@
+     undef``". This means that the landingpad should always be entered.
+
+   - When this clause is matched, the selector value will be negative.
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Bill Wendling wrote:
> You might want to be careful here. It sounds like 'filter [0 x i8**] undef' has the same semantics as 'catch i8* null', which I don't think it does. (If it does, that wasn't intended.)
OK, I've added a note to clarify that they are not equivalent, because they produce different selector values.


http://llvm-reviews.chandlerc.com/D2744