fix garble with newer Go tip versions

Some big changes landed in Go for the upcoming 1.20.

While here, remove the use of GOGC=off with make.bash,
as https://go.dev/cl/436235 makes that unnecessary now.

.github/workflows/test.yml

@@ -78,7 +78,7 @@ jobs:
     steps:
     - name: Install Go
       env:
-        GO_COMMIT: 5f566d35bf7d590c95f4d1b685b995deeb9ba957 # 2022-10-01
+        GO_COMMIT: 122a22e0e9eba7fe712030d429fc4bcf6f447f5e # 2022-11-12
       run: |
         cd $HOME
         mkdir $HOME/gotip
@@ -89,8 +89,7 @@ jobs:
         echo "devel go1.20-${GO_COMMIT}" >VERSION
 
         cd src
-        # GOGC=off helps Go build about 20% faster, if we can spare memory.
-        GOGC=off ./make.bash
+        ./make.bash
         echo "GOROOT=$HOME/gotip" >>$GITHUB_ENV
         echo "$HOME/gotip/bin" >>$GITHUB_PATH
     - uses: actions/checkout@v3

main.go

@@ -729,8 +729,12 @@ func replaceAsmNames(buf *bytes.Buffer, remaining []byte) {
 
 		// If the name was qualified, fetch the package, and write the
 		// obfuscated import path if needed.
+		// Note that runtime/internal/startlinetest refers to runtime_test in
+		// one of its assembly files, and we currently do not always collect
+		// test packages in appendListedPackages for the sake of performance.
+		// We don't care about testing the runtime just yet, so work around it.
 		lpkg := curPkg
-		if asmPkgPath != "" {
+		if asmPkgPath != "" && asmPkgPath != "runtime_test" {
 			var err error
 			lpkg, err = listPackage(goPkgPath)
 			if err != nil {

shared.go

@@ -336,14 +336,18 @@ func listPackage(path string) (*listedPackage, error) {
 			panic(fmt.Sprintf("package %q still missing after go list call", path))
 		}
 		startTime := time.Now()
-		// Obtained via scripts/runtime-linknamed-nodeps.sh as of 2022-10-01.
+		// Obtained via scripts/runtime-linknamed-nodeps.sh as of 2022-11-01.
 		runtimeLinknamed := []string{
+			"arena",
 			"crypto/internal/boring",
 			"crypto/internal/boring/bcache",
 			"crypto/internal/boring/fipstls",
 			"crypto/x509/internal/macos",
+			"internal/godebug",
 			"internal/poll",
 			"internal/reflectlite",
+			"internal/syscall/unix",
+			"math/rand",
 			"net",
 			"os",
 			"os/signal",

testdata/script/reverse.txtar

@@ -30,7 +30,8 @@ cp stderr build-error.stderr
 
 stdin build-error.stderr
 garble reverse ./build-error
-cmp stdout build-error-reverse.stdout
+[!go1.20] cmp stdout build-error-reverse.stdout-go1.19
+[go1.20] cmp stdout build-error-reverse.stdout-go1.20
 
 [short] stop # no need to verify this with -short
 
@@ -158,8 +159,13 @@ main.main(...)
 	test/main/long_main.go:11 +0x??
 
 main filename: test/main/long_main.go
--- build-error-reverse.stdout --
+-- build-error-reverse.stdout-go1.19 --
 # test/main/build-error
 test/main/build-error/error.go:18: cannot convert UnobfuscatedStruct{} (value of type UnobfuscatedStruct) to type struct{SomeField int}
 exit status 2
 exit status 2
+-- build-error-reverse.stdout-go1.20 --
+go build test/main/build-error: # test/main/build-error
+test/main/build-error/error.go:18: cannot convert UnobfuscatedStruct{} (value of type UnobfuscatedStruct) to type struct{SomeField int}
+exit status 2
+exit status 1