Disentangle assembler from isolate.

src/mips64/assembler-mips64.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 372 matching lines @@
   // for a detailed comment on the layout (globals.h).
   //
   // If the provided buffer is NULL, the assembler allocates and grows its own
   // buffer, and buffer_size determines the initial buffer size. The buffer is
   // owned by the assembler and deallocated upon destruction of the assembler.
   //
   // If the provided buffer is not NULL, the assembler uses the provided buffer
   // for code generation and assumes its size to be buffer_size. If the buffer
   // is too small, a fatal error occurs. No deallocation of the buffer is done
   // upon destruction of the assembler.
-  Assembler(Isolate* isolate, void* buffer, int buffer_size);
+  Assembler(Isolate* isolate, void* buffer, int buffer_size)
+      : Assembler(IsolateData(isolate), buffer, buffer_size) {}
+  Assembler(IsolateData isolate_data, void* buffer, int buffer_size);
   virtual ~Assembler() { }
 
   // GetCode emits any pending (non-emitted) code and fills the descriptor
   // desc. GetCode() is idempotent; it returns the same result if no other
   // Assembler functions are invoked in between GetCode() calls.
   void GetCode(CodeDesc* desc);
 
   // Label operations & relative jumps (PPUM Appendix D).
   //
   // Takes a branch opcode (cc) and a label (L) and generates
@@ skipping 51 matching lines @@
     return branch_offset26(L) >> 2;
   }
   uint64_t jump_address(Label* L);
   uint64_t jump_offset(Label* L);
 
   // Puts a labels target address at the given position.
   // The high 8 bits are set to zero.
   void label_at_put(Label* L, int at_offset);
 
   // Read/Modify the code target address in the branch/call instruction at pc.
+  // The isolate argument is unused (and may be nullptr) when skipping flushing.
   static Address target_address_at(Address pc);
   static void set_target_address_at(
       Isolate* isolate, Address pc, Address target,
       ICacheFlushMode icache_flush_mode = FLUSH_ICACHE_IF_NEEDED);
   // On MIPS there is no Constant Pool so we skip that parameter.
   INLINE(static Address target_address_at(Address pc, Address constant_pool)) {
     return target_address_at(pc);
   }
   INLINE(static void set_target_address_at(
       Isolate* isolate, Address pc, Address constant_pool, Address target,
@@ skipping 1048 matching lines @@
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM_ASSEMBLER_MIPS_H_