chore: sync with go1.18.10

Author: ldez

internal/cache/cache.go

@@ -576,3 +576,15 @@ func (c *Cache) copyFile(file io.ReadSeeker, out OutputID, size int64) error {
 
 	return nil
 }
+
+// FuzzDir returns a subdirectory within the cache for storing fuzzing data.
+// The subdirectory may not exist.
+//
+// This directory is managed by the internal/fuzz package. Files in this
+// directory aren't removed by the 'go clean -cache' command or by Trim.
+// They may be removed with 'go clean -fuzzcache'.
+//
+// TODO(#48526): make Trim remove unused files from this directory.
+func (c *Cache) FuzzDir() string {
+	return filepath.Join(c.dir, "fuzz")
+}

internal/cache/readme.md

@@ -2,6 +2,7 @@
 
 Extracted from `go/src/cmd/go/internal/cache/`.
 
+- sync with go1.18.10
 - sync with go1.17.13
 - sync with go1.16.15
 - sync with go1.15.15