Allow Turbofan optimization of Ignition generators

src/compiler/register-allocator.cc

 // Copyright 2014 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/base/adapters.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/register-allocator.h"
 #include "src/string-stream.h"
 
 namespace v8 {
@@ skipping 3070 matching lines @@
   // spill range.
   LifetimePosition next_pos = range->Start();
   if (next_pos.IsGapPosition()) next_pos = next_pos.NextStart();
   UsePosition* pos = range->NextUsePositionRegisterIsBeneficial(next_pos);
   if (pos == nullptr) {
     SpillRange* spill_range =
         range->TopLevel()->HasSpillRange()
             ? range->TopLevel()->GetSpillRange()
             : data()->AssignSpillRangeToLiveRange(range->TopLevel());
     bool merged = first_op_spill->TryMerge(spill_range);
-    CHECK(merged);
+    if (!merged) return false;
     Spill(range);
     return true;
   } else if (pos->pos() > range->Start().NextStart()) {
     SpillRange* spill_range =
         range->TopLevel()->HasSpillRange()
             ? range->TopLevel()->GetSpillRange()
             : data()->AssignSpillRangeToLiveRange(range->TopLevel());
     bool merged = first_op_spill->TryMerge(spill_range);
-    CHECK(merged);
+    if (!merged) return false;
     SpillBetween(range, range->Start(), pos->pos());
     DCHECK(UnhandledIsSorted());
     return true;
   }
   return false;
 }
 
 
 void LinearScanAllocator::SpillAfter(LiveRange* range, LifetimePosition pos) {
   LiveRange* second_part = SplitRangeAt(range, pos);
@@ skipping 546 matching lines @@
         }
       }
     }
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8