A64: Tidy up a few TODOs.

src/a64/assembler-a64.h

 // Copyright 2013 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 828 matching lines @@
     ASSERT(size >= 0);
     ASSERT(static_cast<uint64_t>(size) == SizeOfCodeGeneratedSince(label));
   }
 
   // Return the number of instructions generated from label to the
   // current position.
   int InstructionsGeneratedSince(const Label* label) {
     return SizeOfCodeGeneratedSince(label) / kInstructionSize;
   }
 
-  // TODO(all): Initialize these constants related with code patching.
-  // TODO(all): Set to -1 to hopefully crash if mistakenly used.
-
   // Number of instructions generated for the return sequence in
   // FullCodeGenerator::EmitReturnSequence.
   static const int kJSRetSequenceInstructions = 7;
   // Distance between start of patched return sequence and the emitted address
   // to jump to.
   static const int kPatchReturnSequenceAddressOffset =  0;
   static const int kPatchDebugBreakSlotAddressOffset =  0;
 
   // Number of instructions necessary to be able to later patch it to a call.
   // See Debug::GenerateSlot() and BreakLocationIterator::SetDebugBreakAtSlot().
@@ skipping 1330 matching lines @@
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_ASSEMBLER_A64_H_