Second attempt: Improve our type feedback by recogizining never-executed IC c...

src/ia32/assembler-ia32.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 553 matching lines @@
   static const int kCallInstructionLength = 5;
   static const int kJSReturnSequenceLength = 6;
 
   // The debug break slot must be able to contain a call instruction.
   static const int kDebugBreakSlotLength = kCallInstructionLength;
 
   // One byte opcode for test eax,0xXXXXXXXX.
   static const byte kTestEaxByte = 0xA9;
   // One byte opcode for test al, 0xXX.
   static const byte kTestAlByte = 0xA8;
+  // One byte opcode for nop.
+  static const byte kNopByte = 0x90;
+
+  // One byte opcode for a short unconditional jump.
+  static const byte kJmpShortOpcode = 0xEB;
+  // One byte prefix for a short conditional jump.
+  static const byte kJccShortPrefix = 0x70;
+  static const byte kJncShortOpcode = kJccShortPrefix | not_carry;
+  static const byte kJcShortOpcode = kJccShortPrefix | carry;
 
   // ---------------------------------------------------------------------------
   // Code generation
   //
   // - function names correspond one-to-one to ia32 instruction mnemonics
   // - unless specified otherwise, instructions operate on 32bit operands
   // - instructions on 8bit (byte) operands/registers have a trailing '_b'
   // - instructions on 16bit (word) operands/registers have a trailing '_w'
   // - naming conflicts with C++ keywords are resolved via a trailing '_'
 
@@ skipping 483 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_ASSEMBLER_IA32_H_