[unittests] Make some parseIR calls more readable, NFC
[unittests] Make some parseIR calls more readable, NFC

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@326620 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 3ca5091556a3059a9239d7e34aeccb195c3dade9)

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