[LDist] Port to new streaming API for opt remarks
[LDist] Port to new streaming API for opt remarks

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@282838 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 91f3caeaf59816f154a1e33456d41a200b534a53)

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