cmd/compile: a couple of minor comment fixes

Change-Id: If1d08a84c9295816489b1cfdd031ba12892ae963
Reviewed-on: https://go-review.googlesource.com/31598Reviewed-by: Matthew Dempsky <mdempsky@google.com>

src/cmd/compile/internal/gc/go.go

@@ -30,7 +30,7 @@ type Pkg struct {
 // an object declared within a package, but Syms are also used to name internal
 // synthesized objects.
 //
-// As a special exception, field and method names that are exported use the Sym
+// As an exception, field and method names that are exported use the Sym
 // associated with localpkg instead of the package that declared them. This
 // allows using Sym pointer equality to test for Go identifier uniqueness when
 // handling selector expressions.
@@ -42,7 +42,7 @@ type Sym struct {
 
 	// saved and restored by dcopy
 	Pkg        *Pkg
-	Name       string // variable name
+	Name       string // object name
 	Def        *Node  // definition: ONAME OTYPE OPACK or OLITERAL
 	Block      int32  // blocknumber to catch redeclaration
 	Lastlineno int32  // last declaration for diagnostic

src/cmd/compile/internal/gc/typecheck.go

@@ -3660,9 +3660,8 @@ func typecheckdef(n *Node) *Node {
 	default:
 		Fatalf("typecheckdef %v", n.Op)
 
-		// not really syms
-	case OGOTO, OLABEL:
-		break
+	case OGOTO, OLABEL, OPACK:
+		// nothing to do here
 
 	case OLITERAL:
 		if n.Name.Param.Ntype != nil {
@@ -3770,10 +3769,6 @@ func typecheckdef(n *Node) *Node {
 		if Curfn != nil {
 			resumecheckwidth()
 		}
-
-		// nothing to see here
-	case OPACK:
-		break
 	}
 
 ret: