Adding -suppressExcessPropertyErrors compiler option

src/compiler/commandLineParser.ts

@@ -184,6 +184,12 @@ namespace ts {
             description: Diagnostics.Specifies_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations,
             paramType: Diagnostics.LOCATION,
         },
+        {
+            name: "suppressExcessPropertyErrors",
+            type: "boolean",
+            description: Diagnostics.Suppress_excess_property_checks_for_object_literals,
+            experimental: true
+        },
         {
             name: "suppressImplicitAnyIndexErrors",
             type: "boolean",