Clarify that all manipulatable values must be of first class type, and specifically update the PHI node entry to mention this as well.
Clarify that all manipulatable values must be of first class type, and specifically
update the PHI node entry to mention this as well.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@9606 91177308-0d34-0410-b5e6-96231b3b80d8

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