7018753: tools/javac/varargs/warning/Warn5.java times out on slow machines
Summary: Use a single file manager for all JavacTasks
Reviewed-by: jjg, mcimadamore
1 T6230128.java:11:10: compiler.err.override.weaker.access: (compiler.misc.cant.override: foo(java.lang.Object...), A1a, foo(java.lang.Object[]), A1), public