[turbofan] Turn DCHECK for fixed slot index into a CHECK.

src/compiler/instruction.h

 // 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.
 
 #ifndef V8_COMPILER_INSTRUCTION_H_
 #define V8_COMPILER_INSTRUCTION_H_
 
 #include <deque>
 #include <iosfwd>
 #include <map>
@@ skipping 111 matching lines @@
     value_ |= ExtendedPolicyField::encode(policy);
     value_ |= LifetimeField::encode(USED_AT_END);
   }
 
   UnallocatedOperand(BasicPolicy policy, int index)
       : InstructionOperand(UNALLOCATED, 0) {
     DCHECK(policy == FIXED_SLOT);
     value_ |= VirtualRegisterField::encode(kInvalidVirtualRegister);
     value_ |= BasicPolicyField::encode(policy);
     value_ |= index << FixedSlotIndexField::kShift;
-    DCHECK(this->fixed_slot_index() == index);
+    // TODO(dcarney): 2^10 is not enough for the fixed slot index.
+    CHECK(this->fixed_slot_index() == index);
   }
 
   UnallocatedOperand(ExtendedPolicy policy, int index)
       : InstructionOperand(UNALLOCATED, 0) {
     DCHECK(policy == FIXED_REGISTER || policy == FIXED_DOUBLE_REGISTER);
     value_ |= VirtualRegisterField::encode(kInvalidVirtualRegister);
     value_ |= BasicPolicyField::encode(EXTENDED_POLICY);
     value_ |= ExtendedPolicyField::encode(policy);
     value_ |= LifetimeField::encode(USED_AT_END);
     value_ |= FixedRegisterField::encode(index);
@@ skipping 943 matching lines @@
 
 
 std::ostream& operator<<(std::ostream& os,
                          const PrintableInstructionSequence& code);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_H_