Changes to generation of .tsbuildinfo:

- If composite or incremental then only the .tsbuildinfo will be generated
- if --out or --outFile the file is outputFile.tsbuildinfo
- if rootDir and outDir then outdir/relativePathOfConfigFromRootDir/configname.tsbuildinfo
- if just outDir then outDir/configname.tsbuild
- otherwise config.tsbuildinfo next to configFile

src/compiler/commandLineParser.ts

@@ -331,6 +331,13 @@ namespace ts {
             category: Diagnostics.Basic_Options,
             description: Diagnostics.Enable_project_compilation,
         },
+        {
+            name: "incremental",
+            type: "boolean",
+            isTSConfigOnly: true,
+            category: Diagnostics.Basic_Options,
+            description: Diagnostics.Enable_incremental_compilation,
+        },
         {
             name: "removeComments",
             type: "boolean",