code review 12486043: all: use strings.IndexByte instead of Index where possible

src/pkg/encoding/xml/xml.go

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // Package xml implements a simple XML 1.0 parser that
 // understands XML name spaces.
 package xml
 
 // References:
 //    Annotated XML spec: http://www.xml.com/axml/testaxml.htm
@@ skipping 1008 matching lines @@
                 r >= 0x10000 && r <= 0x10FFFF
 }
 
 // Get name space name: name with a : stuck in the middle.
 // The part before the : is the name space identifier.
 func (d *Decoder) nsname() (name Name, ok bool) {
         s, ok := d.name()
         if !ok {
                 return
         }
-        i := strings.Index(s, ":")
+        i := strings.IndexByte(s, ':')
         if i < 0 {
                 name.Local = s
         } else {
                 name.Space = s[0:i]
                 name.Local = s[i+1:]
         }
         return name, true
 }
 
 // Get name: /first(first|second)*/
@@ skipping 760 matching lines @@
         }
         if v[0] != '\'' && v[0] != '"' {
                 return ""
         }
         idx = strings.IndexRune(v[1:], rune(v[0]))
         if idx == -1 {
                 return ""
         }
         return v[1 : idx+1]
 }