[klauspost/deflate-improve-comp] Use pre-compressed bytes for test.

Change-Id: Ie3630fc4b51f30108909a3d5930ffe17851f4a94

Author: klauspost

src/debug/elf/file_test.go

@@ -7,7 +7,6 @@ package elf
 import (
 	"bytes"
 	"compress/gzip"
-	"compress/zlib"
 	"debug/dwarf"
 	"encoding/binary"
 	"errors"
@@ -1560,18 +1559,9 @@ func TestIssue59208(t *testing.T) {
 	zoffset := sec.Offset + uint64(sec.compressionOffset)
 	copy(dn, data[:zoffset])
 
-	ozd, err := sec.Data()
-	if err != nil {
-		t.Fatal(err)
-	}
-	buf := bytes.NewBuffer(nil)
-	wr := zlib.NewWriter(buf)
 	// corrupt origin data same as COMPRESS_ZLIB
-	copy(ozd, []byte{1, 0, 0, 0})
-	wr.Write(ozd)
-	wr.Close()
-
-	copy(dn[zoffset:], buf.Bytes())
+	// Insert zlib compressed sec.Data() block with `[]byte{1, 0, 0, 0}` as the first 4 bytes
+	copy(dn[zoffset:], []byte{0x78, 0x9c, 0x5c, 0x4d, 0xb9, 0xd, 0x80, 0x30, 0xc, 0x3c, 0x7, 0x27, 0xdc, 0xe, 0xc, 0x46, 0x4b, 0x8b, 0x14, 0x51, 0x20, 0x16, 0xa1, 0x67, 0x8b, 0x2c, 0x88, 0xec, 0x44, 0xc2, 0xe2, 0x8a, 0xdc, 0x1b, 0x59, 0x0, 0x28, 0xc, 0x34, 0x9, 0x7f, 0x22, 0x96, 0xa0, 0x13, 0x67, 0x27, 0xa1, 0x53, 0xea, 0x4e, 0x47, 0x58, 0x7a, 0x98, 0x8d, 0x26, 0xcd, 0xfb, 0x71, 0x21, 0x31, 0x87, 0x7f, 0xca, 0xf3, 0x1b, 0x7a, 0x21, 0xfa, 0x3f, 0x23, 0x4f, 0x3, 0x50, 0x7a, 0xb9, 0xda, 0xfc, 0xae, 0xc3, 0x35, 0x77, 0x1b, 0x94, 0xd5, 0x82, 0x37, 0x0, 0x0, 0xff, 0xff, 0x65, 0xfb, 0x7, 0x6e})
 	copy(dn[sec.Offset+sec.FileSize:], data[sec.Offset+sec.FileSize:])
 
 	nf, err := NewFile(bytes.NewReader(dn))