cmd/compile: add typPtr

Passes toolstash -cmp.

Change-Id: I721348ed2122b6a9cd87ad2041b6ee3bf6b2bbb5
Reviewed-on: https://go-review.googlesource.com/21306Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

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

@@ -1149,19 +1149,11 @@ var (
 )
 
 func initPtrto() {
-	ptrToUint8 = ptrto1(Types[TUINT8])
-	ptrToAny = ptrto1(Types[TANY])
-	ptrToString = ptrto1(Types[TSTRING])
-	ptrToBool = ptrto1(Types[TBOOL])
-	ptrToInt32 = ptrto1(Types[TINT32])
-}
-
-func ptrto1(t *Type) *Type {
-	t1 := typ(Tptr)
-	t1.Type = t
-	t1.Width = int64(Widthptr)
-	t1.Align = uint8(Widthptr)
-	return t1
+	ptrToUint8 = typPtr(Types[TUINT8])
+	ptrToAny = typPtr(Types[TANY])
+	ptrToString = typPtr(Types[TSTRING])
+	ptrToBool = typPtr(Types[TBOOL])
+	ptrToInt32 = typPtr(Types[TINT32])
 }
 
 // Ptrto returns the Type *t.
@@ -1187,7 +1179,7 @@ func Ptrto(t *Type) *Type {
 	case Types[TBOOL]:
 		return ptrToBool
 	}
-	return ptrto1(t)
+	return typPtr(t)
 }
 
 func frame(context int) {

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

@@ -267,6 +267,15 @@ func typeChan(elem *Type, dir uint8) *Type {
 	return t
 }
 
+// typPtr returns a new pointer type pointing to t.
+func typPtr(elem *Type) *Type {
+	t := typ(Tptr)
+	t.Type = elem
+	t.Width = int64(Widthptr)
+	t.Align = uint8(Widthptr)
+	return t
+}
+
 // typWrapper returns a new wrapper psuedo-type.
 func typWrapper(et EType, wrapped *Type) *Type {
 	switch et {

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

@@ -361,8 +361,7 @@ func typeinit() {
 	dowidth(Types[TSTRING])
 	dowidth(idealstring)
 
-	itable = typ(Tptr)
-	itable.Type = Types[TUINT8]
+	itable = typPtr(Types[TUINT8])
 }
 
 func lexinit1() {