Add type inference for break and continue statements.

pkg/front_end/lib/src/fasta/kernel/body_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/body_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
index 0a2be2bd99acc854a6c2d7f9b3d4f4e0928229ca..dc0d85def1d0b32ba7f55dfb0fd7b489dca3b145 100644
--- a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
@@ -2876,7 +2876,7 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
           "Can't break to '$name' in a different function.",
           breakKeyword.next.charOffset));
     } else {
-      BreakStatement statement = new BreakStatement(null)
+      BreakStatement statement = new KernelBreakStatement(null)
         ..fileOffset = breakKeyword.charOffset;
       target.addBreak(statement);
       push(statement);
@@ -2909,7 +2909,8 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
       }
       if (target.isGotoTarget &&
           target.functionNestingLevel == functionNestingLevel) {
-        ContinueSwitchStatement statement = new ContinueSwitchStatement(null);
+        ContinueSwitchStatement statement =
+            new KernelContinueSwitchStatement(null);
         target.addGoto(statement);
         push(statement);
         return;
@@ -2926,7 +2927,7 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
           "Can't continue at '$name' in a different function.",
           continueKeyword.next.charOffset));
     } else {
-      BreakStatement statement = new BreakStatement(null)
+      BreakStatement statement = new KernelBreakStatement(null)
         ..fileOffset = continueKeyword.charOffset;
       target.addContinue(statement);
       push(statement);