gofmt: experiment: align values in map composites where possible

- gofmt -w src misc
- looking for feedback

R=rsc, r
CC=golang-dev
https://golang.org/cl/223076

src/pkg/xml/xml_test.go

@@ -238,25 +238,25 @@ type allScalars struct {
 }
 
 var all = allScalars{
-	True1: true,
-	True2: true,
-	False1: false,
-	False2: false,
-	Int: 1,
-	Int8: -2,
-	Int16: 3,
-	Int32: -4,
-	Int64: 5,
-	Uint: 6,
-	Uint8: 7,
-	Uint16: 8,
-	Uint32: 9,
-	Uint64: 10,
+	True1:   true,
+	True2:   true,
+	False1:  false,
+	False2:  false,
+	Int:     1,
+	Int8:    -2,
+	Int16:   3,
+	Int32:   -4,
+	Int64:   5,
+	Uint:    6,
+	Uint8:   7,
+	Uint16:  8,
+	Uint32:  9,
+	Uint64:  10,
 	Uintptr: 11,
-	Float: 12.0,
+	Float:   12.0,
 	Float32: 13.0,
 	Float64: 14.0,
-	String: "15",
+	String:  "15",
 }
 
 const testScalarsInput = `<allscalars>