code cleanup: ant, backend modules

compiler/backend/src/org/jetbrains/kotlin/codegen/Callable.kt

@@ -20,7 +20,7 @@ import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
 import org.jetbrains.org.objectweb.asm.Type
 import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter
 
-public trait Callable {
+public interface Callable {
     public val owner: Type
 
     public val dispatchReceiverType: Type?

compiler/backend/src/org/jetbrains/kotlin/codegen/extensions/ClassBuilderInterceptorExtension.kt

@@ -21,7 +21,7 @@ import org.jetbrains.kotlin.diagnostics.DiagnosticSink
 import org.jetbrains.kotlin.extensions.ProjectExtensionDescriptor
 import org.jetbrains.kotlin.resolve.BindingContext
 
-public trait ClassBuilderInterceptorExtension {
+public interface ClassBuilderInterceptorExtension {
     companion object : ProjectExtensionDescriptor<ClassBuilderInterceptorExtension>(
             "org.jetbrains.kotlin.classBuilderFactoryInterceptorExtension", javaClass<ClassBuilderInterceptorExtension>())
 

compiler/backend/src/org/jetbrains/kotlin/codegen/extensions/ExpressionCodegenExtension.kt

@@ -27,7 +27,7 @@ import org.jetbrains.kotlin.psi.JetClassOrObject
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.resolve.*
 
-public trait ExpressionCodegenExtension {
+public interface ExpressionCodegenExtension {
     companion object : ProjectExtensionDescriptor<ExpressionCodegenExtension>("org.jetbrains.kotlin.expressionCodegenExtension", javaClass<ExpressionCodegenExtension>())
 
     public class Context(

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/SMAP.kt

@@ -122,7 +122,7 @@ public open class InlineLambdaSourceMapper(parent: SourceMapper, smap: SMAPAndMe
     }
 }
 
-trait SourceMapper {
+interface SourceMapper {
 
     val resultMappings: List<FileMapping>
     val parent: SourceMapper?

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/TryBlockClustering.kt

@@ -30,7 +30,7 @@ public class SplitPair<T: Interval>(val patchedPart: T, val newPart: T)
 
 class SimpleInterval(override val startLabel: LabelNode, override val endLabel: LabelNode ) : Interval
 
-trait Interval {
+interface Interval {
     val startLabel: LabelNode
     val endLabel: LabelNode
 
@@ -39,12 +39,12 @@ trait Interval {
 
 }
 
-trait SplittableInterval<T: Interval> : Interval {
+interface SplittableInterval<T: Interval> : Interval {
     fun split(splitBy: Interval, keepStart: Boolean): SplitPair<T>
 }
 
 
-trait IntervalWithHandler : Interval {
+interface IntervalWithHandler : Interval {
     val handler: LabelNode
     val type: String?
 }