A64: Implement LOsrEntry and LUnknownOSRValue

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 1371 matching lines @@
   // Instruction synchronization barrier
   void isb();
 
   // Alias for system instructions.
   void nop() { hint(NOP); }
 
   // Different nop operations are used by the code generator to detect certain
   // states of the generated code.
   enum NopMarkerTypes {
     DEBUG_BREAK_NOP,
+    INTERRUPT_CODE_NOP,
     FIRST_NOP_MARKER = DEBUG_BREAK_NOP,
-    LAST_NOP_MARKER = DEBUG_BREAK_NOP
+    LAST_NOP_MARKER = INTERRUPT_CODE_NOP
   };
 
   inline void nop(NopMarkerTypes n) {
     ASSERT((FIRST_NOP_MARKER <= n) && (n <= LAST_NOP_MARKER));
     mov(Register::XRegFromCode(n), Register::XRegFromCode(n));
   }
 
   // FP instructions.
   // Move immediate to FP register.
   void fmov(FPRegister fd, double imm);
@@ skipping 624 matching lines @@
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_ASSEMBLER_A64_H_