[LangRef] Explicitly allow readnone and reaodnly functions to unwind

[sanjoy]

Summary

This change edits the language reference to explicitly allow the
existence of readnone and readonly functions that can throw. Full
discussion at
http://lists.llvm.org/pipermail/llvm-dev/2017-January/108637.html

[sanjoy]

ping!

[sanjoy]

ping! x 2

[majnemer]

LGTM

docs/LangRef.rst

``"patchable-function"``
     patching may have to be separately conveyed via the linkage type.
 ``readnone``
     On a function, this attribute indicates that the function computes its
     result (or decides to unwind an exception) based strictly on its arguments,
     without dereferencing any pointer arguments or otherwise accessing
     any mutable state (e.g. memory, control registers, etc) visible to
     caller functions. It does not write through any pointer arguments
     (including ``byval`` arguments) and never changes any state visible
-    to callers. This means that it cannot unwind exceptions by calling
-    the ``C++`` exception throwing methods.
+    to callers. This means while it cannot unwind exceptions by calling
+    the ``C++`` exception throwing methods (since they write to memory), there may
+    be non-``C++`` mechanisms that throw exceptions without writing to LLVM
+    visible memory.
 
     On an argument, this attribute indicates that the function does not
     dereference that pointer argument, even though it may read or write the
     memory that the pointer points to if accessed through other pointers.
 ``readonly``
     On a function, this attribute indicates that the function does not write
     through any pointer arguments (including ``byval`` arguments) or otherwise
     modify any state (e.g. memory, control registers, etc) visible to
     caller functions. It may dereference pointer arguments and read
     state that may be set in the caller. A readonly function always
     returns the same value (or unwinds an exception identically) when
-    called with the same set of arguments and global state. It cannot
-    unwind an exception by calling the ``C++`` exception throwing
-    methods.
+    called with the same set of arguments and global state.  This means while it
+    cannot unwind exceptions by calling the ``C++`` exception throwing methods
+    (since they write to memory), there may be non-``C++`` mechanisms that throw
+    exceptions without writing to LLVM visible memory.
 
     On an argument, this attribute indicates that the function does not write
     through this pointer argument, even though it may write to the memory that
     the pointer points to.
 ``writeonly``
     On a function, this attribute indicates that the function may write to but
     does not read from memory.