Simplify and fix code aging.

src/arm/codegen-arm.cc

 // Copyright 2012 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 597 matching lines @@
     CodePatcher patcher(byte_sequence, kNoCodeAgeSequenceLength);
     patcher.masm()->stm(db_w, sp, r1.bit() | cp.bit() | fp.bit() | lr.bit());
     patcher.masm()->LoadRoot(ip, Heap::kUndefinedValueRootIndex);
     patcher.masm()->add(fp, sp, Operand(2 * kPointerSize));
     initialized = true;
   }
   return byte_sequence;
 }
 
 
-byte* Code::FindPlatformCodeAgeSequence() {
-  byte* start = instruction_start();
-  uint32_t young_length;
-  byte* young_sequence = GetNoCodeAgeSequence(&young_length);
-  if (!memcmp(start, young_sequence, young_length) ||
-      Memory::uint32_at(start) == kCodeAgePatchFirstInstruction) {
-    return start;
-  } else {
-    byte* start_after_strict = NULL;
-    if (kind() == FUNCTION) {
-      start_after_strict = start + kSizeOfFullCodegenStrictModePrologue;
-    } else {
-      ASSERT(kind() == OPTIMIZED_FUNCTION);
-      start_after_strict = start + kSizeOfOptimizedStrictModePrologue;
-    }
-    ASSERT(!memcmp(start_after_strict, young_sequence, young_length) ||
-           Memory::uint32_at(start_after_strict) ==
-           kCodeAgePatchFirstInstruction);
-    return start_after_strict;
-  }
-}
-
-
 bool Code::IsYoungSequence(byte* sequence) {
   uint32_t young_length;
   byte* young_sequence = GetNoCodeAgeSequence(&young_length);
   bool result = !memcmp(sequence, young_sequence, young_length);
   ASSERT(result ||
          Memory::uint32_at(sequence) == kCodeAgePatchFirstInstruction);
   return result;
 }
 
 
@@ skipping 25 matching lines @@
     patcher.masm()->add(r0, pc, Operand(-8));
     patcher.masm()->ldr(pc, MemOperand(pc, -4));
     patcher.masm()->dd(reinterpret_cast<uint32_t>(stub->instruction_start()));
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM