Merge pull request #8787 from RyanCavanaugh/cmdLineHelp

Recognize '-?' / '--?' in tsc

src/compiler/commandLineParser.ts

@@ -37,6 +37,11 @@ namespace ts {
             type: "boolean",
             description: Diagnostics.Print_this_message,
         },
+        {
+            name: "help",
+            shortName: "?",
+            type: "boolean"
+        },
         {
             name: "init",
             type: "boolean",