Add MessageCollector#hasErrors, get rid of MessageSeverityCollector

Also fix duplicated wrapping of a message collector into a message severity
collector (in CLICompiler and in the beginning of doExecute in
K2JVMCompiler/K2JSCompiler)

Original commit: 3c81bb4bfc

jps/jps-plugin/src/org/jetbrains/kotlin/jps/build/KotlinBuilder.kt

@@ -689,8 +689,10 @@ class KotlinBuilder : ModuleLevelBuilder(BuilderCategory.SOURCE_PROCESSOR) {
     }
 
     class MessageCollectorAdapter(private val context: CompileContext) : MessageCollector {
+        private var hasErrors = false
 
         override fun report(severity: CompilerMessageSeverity, message: String, location: CompilerMessageLocation) {
+            hasErrors = hasErrors or severity.isError
             var prefix = ""
             if (severity == EXCEPTION) {
                 prefix = INTERNAL_ERROR_PREFIX
@@ -705,6 +707,8 @@ class KotlinBuilder : ModuleLevelBuilder(BuilderCategory.SOURCE_PROCESSOR) {
             ))
         }
 
+        override fun hasErrors(): Boolean = hasErrors
+
         private fun renderLocationIfNeeded(location: CompilerMessageLocation): String {
             if (location == CompilerMessageLocation.NO_LOCATION) return ""