Introduce "-Xreport-output-files" to report source-output mapping for JPS

This makes "-verbose" not required for JPS to run correctly and
therefore allows to print more useful debugging stuff in the compiler
and read them in CLI, for example. The output will also be more readable
because there'll be no "output" messages

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/CommonCompilerArguments.java

@@ -84,6 +84,9 @@ public abstract class CommonCompilerArguments implements Serializable {
     @Argument(value = "-Xallow-kotlin-package", description = "Allow compiling code in package 'kotlin'")
     public boolean allowKotlinPackage;
 
+    @Argument(value = "-Xreport-output-files", description = "Report source to output files mapping")
+    public boolean reportOutputFiles;
+
     @Argument(value = "-Xplugin", valueDescription = "<path>", description = "Load plugins from the given classpath")
     public String[] pluginClasspaths;
 

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/messages/CompilerMessageSeverity.java

@@ -32,7 +32,7 @@ public enum CompilerMessageSeverity {
     OUTPUT;
 
     public static final EnumSet<CompilerMessageSeverity> ERRORS = EnumSet.of(ERROR, EXCEPTION);
-    public static final EnumSet<CompilerMessageSeverity> VERBOSE = EnumSet.of(OUTPUT, LOGGING);
+    public static final EnumSet<CompilerMessageSeverity> VERBOSE = EnumSet.of(LOGGING);
 
     public boolean isError() {
         return ERRORS.contains(this);