Fix handling Boolean? arguments

Boolean? arguments are seen through java reflection as having type
java.lang.Boolean::class.java, whereas Boolean arguments are seen as
kotlin.Boolean::class.java. This fix moves the type comparision back to
kotlin-types, since both map to kotlin.Boolean::class.

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/parseCommandLineArguments.kt

diff --git a/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/parseCommandLineArguments.kt b/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/parseCommandLineArguments.kt
index d2866ac..c72cc0e 100644
--- a/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/parseCommandLineArguments.kt
+++ b/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/parseCommandLineArguments.kt
@@ -153,7 +153,7 @@
         }
 
         if (argument.value == arg) {
-            if (argument.isAdvanced && getter.returnType != Boolean::class.java) {
+            if (argument.isAdvanced && getter.returnType.kotlin != Boolean::class) {
                 errors.value.extraArgumentsPassedInObsoleteForm.add(arg)
             }
             return true
@@ -211,7 +211,7 @@
 
         val (getter, setter, argument) = argumentField
         val value: Any = when {
-            getter.returnType == Boolean::class.java -> {
+            getter.returnType.kotlin == Boolean::class -> {
                 if (arg.startsWith(argument.value + "=")) {
                     // Can't use toBooleanStrict yet because this part of the compiler is used in Gradle and needs API version 1.4.
                     when (arg.substring(argument.value.length + 1)) {
@@ -272,9 +272,9 @@
     delimiter: String?,
     overrideArguments: Boolean
 ) {
-    when (getter.returnType) {
-        Boolean::class.java, String::class.java -> setter(result, value)
-        Array<String>::class.java -> {
+    when (getter.returnType.kotlin) {
+        Boolean::class, String::class -> setter(result, value)
+        Array<String>::class -> {
             val newElements = if (delimiter.isNullOrEmpty()) {
                 arrayOf(value as String)
             } else {