Reviewed-by: jlahoda

8186708: jshell tool: bad load file garbles message and does not abort
Reviewed-by: jlahoda

Reviewed-by: jlahoda

Summary: Adding a better start pos for vars; always adding a synthetic type tree to vars.
Reviewed-by: mcimadamore

Summary: Add support for 'var' in implicitly typed local variable declarations
Reviewed-by: vromero, jlahoda

Reviewed-by: darcy, ihse

Summary: Generalizing ReusableContext and using it in JShell to speed up processing.
Reviewed-by: mcimadamore, rfield