Implement new support for if statements in top-level code.

src/compiler.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 520 matching lines @@
   ProcessExpression(stmt->expression(), Expression::kEffect);
 }
 
 
 void CodeGenSelector::VisitEmptyStatement(EmptyStatement* stmt) {
   // EmptyStatement is supported.
 }
 
 
 void CodeGenSelector::VisitIfStatement(IfStatement* stmt) {
-  BAILOUT("IfStatement");
+  ProcessExpression(stmt->condition(), Expression::kTest);
+  CHECK_BAILOUT;
+  Visit(stmt->then_statement());
+  CHECK_BAILOUT;
+  Visit(stmt->else_statement());
 }
 
 
 void CodeGenSelector::VisitContinueStatement(ContinueStatement* stmt) {
   BAILOUT("ContinueStatement");
 }
 
 
 void CodeGenSelector::VisitBreakStatement(BreakStatement* stmt) {
   BAILOUT("BreakStatement");
@@ skipping 369 matching lines @@
 
 void CodeGenSelector::VisitThisFunction(ThisFunction* expr) {
   BAILOUT("ThisFunction");
 }
 
 #undef BAILOUT
 #undef CHECK_BAILOUT
 
 
 } }  // namespace v8::internal