Starting in JDK 9, the more aggressive path canonicalization causes diagnostics for entries in archives to use canonical paths.

Here's an example of a 'bad class file' diagnostic that references the path of a class file in a jar archive, and where the compilation refers to the jar via a symlink:

```
mkdir p
echo 'garbage' > p/B.class
jar cvf lib.jar p/B.class
mv lib.jar CLASSPATH
ln -s CLASSPATH lib.jar
echo 'class T extends p.B {}' > T.java

javac -cp lib.jar T.java
```

With JDK 8, the diagnostic path is `lib.jar(p/B.class)`:

```
T.java:1: error: cannot access B
class T extends p.B {}
                 ^
  bad class file: lib.jar(p/B.class)
    illegal start of class file
    Please remove or make sure it appears in the correct subdirectory of the classpath.
```

With JDK >= 9, the diagnostic path is absolute and uses the symlink instead of the user-provided path, e.g. it is now: `/tmp/some/absolute/path/CLASSPATH(/p/B.class)`

```
T.java:1: error: cannot access B
class T extends p.B {}
                 ^
  bad class file: /tmp/some/absolute/path/CLASSPATH(/p/B.class)
    illegal start of class file
    Please remove or make sure it appears in the correct subdirectory of the classpath.
1 error
```

JDK-8181897 are JDK-8178017 related issues where the fix was to restore the pre-JDK 9 behaviour, and stop canonicalizing paths when they appear in diagnostics. I think we should do the same here.

The fix might be something like:

```
--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/file/JavacFileManager.java
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/file/JavacFileManager.java
@@ -313,10 +313,10 @@ synchronized Container getContainer(Path path) throws IOException {
 
         if (attr != null) {
             if (attr.isDirectory()) {
- fs = new DirectoryContainer(realPath);
+ fs = new DirectoryContainer(path);
             } else {
                 try {
- fs = new ArchiveContainer(realPath);
+ fs = new ArchiveContainer(path);
                 } catch (ProviderNotFoundException | SecurityException ex) {
                     throw new IOException(ex);
                 }
```