[Orc] #undef a MACRO after I'm done with it.
[Orc] #undef a MACRO after I'm done with it.

Suggested by Philip Reames in review of r257951.

Thanks Philip!


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@258203 91177308-0d34-0410-b5e6-96231b3b80d8

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