[crankshaft] Fix crash when case labels inline endless loops

src/crankshaft/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 5026 matching lines @@
   BailoutId default_id = BailoutId::None();
   for (int i = 0; i < clause_count; ++i) {
     CaseClause* clause = clauses->at(i);
     if (clause->is_default()) {
       body_blocks.Add(NULL, zone());
       if (default_id.IsNone()) default_id = clause->EntryId();
       continue;
     }
 
     // Generate a compare and branch.
-    CHECK_ALIVE(VisitForValue(clause->label()));
+    CHECK_BAILOUT(VisitForValue(clause->label()));
+    if (current_block() == NULL) return Bailout(kUnsupportedSwitchStatement);
     HValue* label_value = Pop();
 
     Type* label_type = clause->label()->bounds().lower;
     Type* combined_type = clause->compare_type();
     HControlInstruction* compare = BuildCompareInstruction(
         Token::EQ_STRICT, tag_value, label_value, tag_type, label_type,
         combined_type,
         ScriptPositionToSourcePosition(stmt->tag()->position()),
         ScriptPositionToSourcePosition(clause->label()->position()),
         PUSH_BEFORE_SIMULATE, clause->id());
@@ skipping 8561 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8