Address Pete's review comment and define OrigArg on its own line.
Address Pete's review comment and define OrigArg on its own line.

This is a follow-up to r281419.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@281421 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 3cb3e3cdbcdf0384c795a1ad11aa2e3c4e7aa0c0)

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm