8177076: jshell tool: usability of completion Summary: Merging completion and documentation completion, assigning Shift-tab shortcut to fix actions. Reviewed-by: rfield

8175116: jtreg agentvms uses more virtual address space in langtool/test :tier1 runs Summary: Avoiding creation of an unnecessary read edge from jdk.compiler to a newly created unnamed module. Reviewed-by: jlahoda