width, internal/number: regen files using new stringer

The latest version of stringer uses strconv instead of fmt as it's
slightly faster.

Change-Id: Ia956eea144f9cab22e4d621af5bb896cd21b9bb0
Reviewed-on: https://go-review.googlesource.com/127921
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

internal/number/roundingmode_string.go

diff --git a/internal/number/roundingmode_string.go b/internal/number/roundingmode_string.go
index f264ea5..f5cc574 100644
--- a/internal/number/roundingmode_string.go
+++ b/internal/number/roundingmode_string.go
@@ -2,7 +2,7 @@
 
 package number
 
-import "fmt"
+import "strconv"
 
 const _RoundingMode_name = "ToNearestEvenToNearestZeroToNearestAwayToPositiveInfToNegativeInfToZeroAwayFromZeronumModes"
 
@@ -10,7 +10,7 @@
 
 func (i RoundingMode) String() string {
 	if i >= RoundingMode(len(_RoundingMode_index)-1) {
-		return fmt.Sprintf("RoundingMode(%d)", i)
+		return "RoundingMode(" + strconv.FormatInt(int64(i), 10) + ")"
 	}
 	return _RoundingMode_name[_RoundingMode_index[i]:_RoundingMode_index[i+1]]
 }

width/kind_string.go

diff --git a/width/kind_string.go b/width/kind_string.go
index 49bfbf7..edbdc54 100644
--- a/width/kind_string.go
+++ b/width/kind_string.go
@@ -2,7 +2,7 @@
 
 package width
 
-import "fmt"
+import "strconv"
 
 const _Kind_name = "NeutralEastAsianAmbiguousEastAsianWideEastAsianNarrowEastAsianFullwidthEastAsianHalfwidth"
 
@@ -10,7 +10,7 @@
 
 func (i Kind) String() string {
 	if i < 0 || i >= Kind(len(_Kind_index)-1) {
-		return fmt.Sprintf("Kind(%d)", i)
+		return "Kind(" + strconv.FormatInt(int64(i), 10) + ")"
 	}
 	return _Kind_name[_Kind_index[i]:_Kind_index[i+1]]
 }