[opt-viewer] Convert another HTML output to use a multiline string
[opt-viewer] Convert another HTML output to use a multiline string

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@283896 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 43573fb650f911e2ff44e2d07071db7d3803d9e7)

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