Matt Arsenault 907e64b436 Add note to documentation about machine node chains. ...

I've been assuming chain operands were always the first operand,
since the documentation says this. I was confused about why they
were missing after instruction selection. Apparently the convention
changes to using the last operand for MachineSDNodes and I've never
noticed before.

llvm-svn: 216934

2014-09-02 19:18:52 +00:00

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