8174104: Compiler does not allow non-existent module path entry
Reviewed-by: jlahoda

8136930: Simplify use of module-system options by custom launchers
8160489: Multiple -Xpatch lines ignored by javac
8156998: javac should support new option -XinheritRuntimeEnvironment
Reviewed-by: jlahoda, ksrini

8154997: Add examples for jigsaw diagnostics
Reviewed-by: jjg, jlahoda