8153229: JavacFiler.checkFileReopening drowns in exceptions after Modular Runtime Images change

Using Path.equals instead of Files.isSameFile to speed up Filer checks

Reviewed-by: jjg

langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/file/PathFileObject.java

@@ -499,11 +499,10 @@ public abstract class PathFileObject implements JavaFileObject {
     }
 
     boolean isSameFile(PathFileObject other) {
-        try {
+        // By construction, the "path" field should be canonical in all likely, supported scenarios.
-            return Files.isSameFile(path, other.path);
+        // (Any exceptions would involve the use of symlinks within a package hierarchy.)
-        } catch (IOException e) {
+        // Therefore, it is sufficient to check that the paths are .equals.
-            return false;
+        return path.equals(other.path);
-        }
     }
 
     @Override