Fix lingering switch statement test failures.

pkg/compiler/lib/src/ssa/switch_continue_analysis.dart

 import 'package:kernel/ast.dart' as ir;
 
 /// Helper class that traverses a kernel AST subtree to see if it has any
 /// continue statements in the body of any switch cases (having continue
 /// statements results in a more complex generated code).
 class SwitchContinueAnalysis extends ir.Visitor<bool> {
   SwitchContinueAnalysis._();
 
   static bool containsContinue(ir.Statement switchCaseBody) {
     return switchCaseBody.accept(new SwitchContinueAnalysis._());
@@ skipping 39 matching lines @@
       }
     }
     return false;
   }
 
   bool visitSwitchCase(ir.SwitchCase switchCase) {
     return switchCase.body.accept(this);
   }
 
   bool visitIfStatement(ir.IfStatement ifStatement) {
-    if (ifStatement.then.accept(this)) {
-      if (ifStatement.otherwise != null) {
-        return ifStatement.otherwise.accept(this);
-      }
-    }
-    return false;
+    return ifStatement.then.accept(this) ||
+        (ifStatement.otherwise != null && ifStatement.otherwise.accept(this));
   }
 
   bool visitTryCatch(ir.TryCatch tryCatch) {
     if (tryCatch.body.accept(this)) {
       for (var catchStatement in tryCatch.catches) {
         if (catchStatement.accept(this)) {
           return true;
         }
       }
     }
@@ skipping 30 matching lines @@
         node is ir.YieldStatement ||
         node is ir.VariableDeclaration) {
       return false;
     }
     throw 'Statement type ${node.runtimeType} not handled in '
         'SwitchContinueAnalysis';
   }
 
   bool defaultNode(ir.Node node) => false;
 }