add BindingUtilsPackage.isUnreachableCode

compiler/frontend/src/org/jetbrains/jet/lang/cfg/JetFlowInformationProvider.java

@@ -260,6 +260,7 @@ public class JetFlowInformationProvider {
     private void reportUnreachableCode(@NotNull UnreachableCode unreachableCode) {
         for (JetElement element : unreachableCode.getElements()) {
             trace.report(UNREACHABLE_CODE.on(element, unreachableCode.getUnreachableTextRanges(element)));
+            trace.record(BindingContext.UNREACHABLE_CODE, element, true);
         }
     }
 

compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingContext.java

@@ -138,6 +138,7 @@ public interface BindingContext {
      */
     WritableSlice<JetExpression, Boolean> PROCESSED = Slices.createSimpleSetSlice();
     WritableSlice<JetElement, Boolean> USED_AS_EXPRESSION = Slices.createRemovableSetSlice();
+    WritableSlice<JetElement, Boolean> UNREACHABLE_CODE = Slices.createRemovableSetSlice();
 
     WritableSlice<VariableDescriptor, CaptureKind> CAPTURED_IN_CLOSURE = new BasicWritableSlice<VariableDescriptor, CaptureKind>(DO_NOTHING);
 

compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingContextUtils.kt

@@ -46,6 +46,7 @@ public fun JetReturnExpression.getTargetFunctionDescriptor(context: BindingConte
 public fun JetExpression.isUsedAsExpression(context: BindingContext): Boolean = context[BindingContext.USED_AS_EXPRESSION, this]!!
 public fun JetExpression.isUsedAsStatement(context: BindingContext): Boolean = !isUsedAsExpression(context)
 
+
 public fun <C : ResolutionContext<C>> ResolutionContext<C>.recordScopeAndDataFlowInfo(expression: JetExpression?) {
     if (expression == null) return
 
@@ -57,3 +58,6 @@ public fun <C : ResolutionContext<C>> ResolutionContext<C>.recordScopeAndDataFlo
 
 public fun BindingContext.getDataFlowInfo(expression: JetExpression?): DataFlowInfo =
     expression?.let { this[BindingContext.EXPRESSION_DATA_FLOW_INFO, it] } ?: DataFlowInfo.EMPTY
+
+public fun JetExpression.isUnreachableCode(context: BindingContext): Boolean = context[BindingContext.UNREACHABLE_CODE, this]!!
+