JACOBIN-333 Added -ea command line option for compatibility with JDK.…

… It does nothing. However, it's needed for Jacotest suite.

src/jvm/option_table_loader.go

@@ -70,6 +70,9 @@ func LoadOptionsTable(Global globals.Globals) {
 	Global.Options["--dry-run"] = dryRun
 	dryRun.Set = true
 
+	ea := globals.Option{false, false, 0, enableAssertions}
+	Global.Options["-ea"] = ea
+
 	help := globals.Option{true, false, 0, showHelpStderrAndExit}
 	Global.Options["-h"] = help
 	Global.Options["-help"] = help
@@ -186,6 +189,12 @@ func enableTraceInstructions(pos int, argValue string, gl *globals.Globals) (int
 	return pos, nil
 }
 
+func enableAssertions(pos int, name string, gl *globals.Globals) (int, error) {
+	// at present, this option is accepted but does nothing. Its acceptance is needed
+	// in order to enable certain functionality in the Jacotest suite
+	return pos, nil
+}
+
 // set verbosity level. Note Jacobin starts up at WARNING level, so there is no
 // need to set it to that level. You cannot set the level to coarser than WARNING
 // which is why there is no way to set the verbosity to SEVERE only.