cmd/cue: use fewer go/packages Need bits in get go

NeedFiles and NeedTypesSizes are unnecessary.
Most of the current slowness is due to NeedSyntax and NeedTypes
being combined with NeedDeps, meaning that we must parse and typecheck
all transitive dependencies - but `get go` needs this as it
recurses into all dependencies by design.

Signed-off-by: Daniel Martí <[email protected]>
Change-Id: I5e6f4d7d9771c75f2f1317874c91b8072376abb9
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1198962
Unity-Result: CUE porcuepine <[email protected]>
Reviewed-by: Roger Peppe <[email protected]>
TryBot-Result: CUEcueckoo <[email protected]>

Author: mvdan

cmd/cue/cmd/get_go.go

@@ -370,10 +370,9 @@ func extract(cmd *Command, args []string) error {
 	root := binst.Root
 
 	cfg := &packages.Config{
-		Mode: packages.NeedName | packages.NeedFiles | packages.NeedCompiledGoFiles |
-			packages.NeedImports | packages.NeedTypes | packages.NeedTypesSizes |
-			packages.NeedSyntax | packages.NeedTypesInfo | packages.NeedDeps |
-			packages.NeedModule,
+		Mode: packages.NeedName | packages.NeedCompiledGoFiles |
+			packages.NeedImports | packages.NeedDeps | packages.NeedTypes |
+			packages.NeedSyntax | packages.NeedTypesInfo | packages.NeedModule,
 	}
 	pkgs, err := packages.Load(cfg, args...)
 	if err != nil {