add crypto/internal/boring/bcache to runtimeLinknamed

A chunk from crypto/internal/boring has been split away as a separate
package very recently, shortly before 1.19rc1 is due for release.
See https://go.dev/cl/407135 for more information.

Makes garble work on the latest Go tip again.

.github/workflows/test.yml

@@ -77,7 +77,7 @@ jobs:
     steps:
     - name: Install Go
       env:
-        GO_COMMIT: 2882786bf4cd779f166e9ced82a4da2ea0f8b1f9 # 2022-06-08
+        GO_COMMIT: 160414ca6a30a210b82fb09abbd3541802a51017 # 2022-06-29
       run: |
         cd $HOME
         mkdir $HOME/gotip

shared.go

@@ -283,7 +283,7 @@ var cannotObfuscate = map[string]bool{
 	"runtime/cgo": true,
 }
 
-// Obtained from "go list -deps runtime" on Go 1.19beta1.
+// Obtained from "go list -deps runtime" as of June 29th.
 // Note that the same command on Go 1.18 results in the same list.
 var runtimeAndDeps = map[string]bool{
 	"internal/goarch":          true,
@@ -329,9 +329,10 @@ 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 Go 1.19beta1.
+		// Obtained via scripts/runtime-linknamed-nodeps.sh as of June 29th.
 		runtimeLinknamed := []string{
 			"crypto/internal/boring",
+			"crypto/internal/boring/bcache",
 			"crypto/internal/boring/fipstls",
 			"crypto/x509/internal/macos",
 			"internal/poll",