Update to Swift 5.2 2020-03-09 snapshot

Author: mattt

Package.resolved

@@ -14,7 +14,7 @@ let package = Package(
     ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
-        .package(url: "https://github.com/apple/swift-syntax.git", .revision("swift-5.2-DEVELOPMENT-SNAPSHOT-2020-02-12-a")),
+        .package(url: "https://github.com/apple/swift-syntax.git", .revision("swift-5.2-DEVELOPMENT-SNAPSHOT-2020-03-09-a")),
     ],
     targets: [
         // Targets are the basic building blocks of a package. A target can define a module or a test suite.