html/template: runtime error: slice bounds out of range

The following program crashes with panic:

``` go
package main

import (
    "html/template"
    "io/ioutil"
)

func main() {
    t, err := template.New("foo").Parse(string(data))
    if err != nil {
        return
    }
    t.Execute(ioutil.Discard, nil)
}

var data = "<style>.000000000000" +
    "00.0000000000V000000" +
    "000\x880000000000000000" +
    "00\xa4000\x8e\x9200\x8b\xe0\x85\xbd000000" +
    "0</style"

```

```
panic: runtime error: slice bounds out of range

goroutine 1 [running]:
html/template.contextAfterText(0x20000000001, 0x0, 0xc208020126, 0x52, 0x5a, 0x0, 0x0, 0x6)
    src/html/template/escape.go:671 +0x2db
html/template.(*escaper).escapeText(0xc208010540, 0x20000000001, 0x0, 0xc208014810, 0x0, 0x0)
    src/html/template/escape.go:596 +0x199
html/template.(*escaper).escape(0xc208010540, 0x0, 0x0, 0x7f4c7b7951e8, 0xc208014810, 0x700000000000000, 0x0)
    src/html/template/escape.go:129 +0x31a
html/template.(*escaper).escapeList(0xc208010540, 0x0, 0x0, 0xc2080147e0, 0x0, 0x0)
    src/html/template/escape.go:440 +0x1c9
html/template.(*escaper).escapeListConditionally(0xc208010500, 0x0, 0x0, 0xc2080147e0, 0xc2080419b0, 0x0, 0x0, 0x7f4c7b941000)
    src/html/template/escape.go:455 +0x4be
html/template.(*escaper).escapeTemplateBody(0xc208010500, 0x0, 0x0, 0xc208010440, 0x0, 0x0, 0xae00000000000058)
    src/html/template/escape.go:573 +0x1e2
html/template.(*escaper).computeOutCtx(0xc208010500, 0x0, 0x0, 0xc208010440, 0x0, 0x0)
    src/html/template/escape.go:534 +0xc9
html/template.(*escaper).escapeTree(0xc208010500, 0x0, 0x0, 0x7f4c7b795230, 0xc2080147e0, 0x5ba240, 0x3, 0x0, 0x0, 0x0, ...)
    src/html/template/escape.go:527 +0x77f
html/template.escapeTemplate(0xc2080146f0, 0x7f4c7b795230, 0xc2080147e0, 0x5ba240, 0x3, 0x0, 0x0)
    src/html/template/escape.go:23 +0x334
html/template.(*Template).escape(0xc2080146f0, 0x0, 0x0)
    src/html/template/template.go:85 +0x35d
html/template.(*Template).Execute(0xc2080146f0, 0x7f4c7b7951c0, 0xc20800a4c0, 0x0, 0x0, 0x0, 0x0)
    src/html/template/template.go:101 +0x37
main.main()
    /tmp/htmltempl.go:13 +0x290
```

on commit ccc76db


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html/template: runtime error: slice bounds out of range #10612

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html/template: runtime error: slice bounds out of range #10612

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