[PATCH] Add note to documentation about machine node chains.

[Matt Arsenault]

Note that the chain isn't necessarily the last operand for a machine node, and can still be followed by glue

http://reviews.llvm.org/D4698

Files:
  docs/CodeGenerator.rst

Index: docs/CodeGenerator.rst
===================================================================
--- docs/CodeGenerator.rst
+++ docs/CodeGenerator.rst
@@ -769,7 +769,9 @@
 calls, returns, etc).  All nodes that have side effects should take a token
 chain as input and produce a new one as output.  By convention, token chain
 inputs are always operand #0, and chain results are always the last value
-produced by an operation.
+produced by an operation. However, after instruction selection, the
+machine nodes have their chain after the instruction's operands, and
+by be followed by glue nodes.
 
 A SelectionDAG has designated "Entry" and "Root" nodes.  The Entry node is
 always a marker node with an Opcode of ``ISD::EntryToken``.  The Root node is
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