cmd/compile: remove dead code

Change-Id: I2d287981d5fcef3aace948c405d618f46200948e
Reviewed-on: https://go-review.googlesource.com/41450
Run-TryBot: Todd Neal <todd@tneal.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/compile/internal/ssa/rewrite.go

@@ -6,12 +6,10 @@ package ssa
 
 import (
 	"cmd/internal/obj"
-	"crypto/sha1"
 	"fmt"
 	"math"
 	"os"
 	"path/filepath"
-	"strings"
 )
 
 func applyRewrite(f *Func, rb blockRewriter, rv valueRewriter) {
@@ -572,20 +570,6 @@ func min(x, y int64) int64 {
 	return y
 }
 
-func experiment(f *Func) bool {
-	hstr := ""
-	for _, b := range sha1.Sum([]byte(f.Name)) {
-		hstr += fmt.Sprintf("%08b", b)
-	}
-	r := strings.HasSuffix(hstr, "00011")
-	_ = r
-	r = f.Name == "(*fmt).fmt_integer"
-	if r {
-		fmt.Printf("             enabled for %s\n", f.Name)
-	}
-	return r
-}
-
 func isConstZero(v *Value) bool {
 	switch v.Op {
 	case OpConstNil: