MIPS64: Fix BlockTrampolinePoolFor() to emit trampoline before blocking, if needed.

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 1324 matching lines @@
   RelocInfoWriter reloc_info_writer;
 
   // The bound position, before this we cannot do instruction elimination.
   int last_bound_pos_;
 
   // Code emission.
   inline void CheckBuffer();
   void GrowBuffer();
   inline void emit(Instr x);
   inline void emit(uint64_t x);
-  inline void CheckTrampolinePoolQuick();
+  inline void CheckTrampolinePoolQuick(int extra_instructions = 0);
 
   // Instruction generation.
   // We have 3 different kind of encoding layout on MIPS.
   // However due to many different types of objects encoded in the same fields
   // we have quite a few aliases for each mode.
   // Using the same structure to refer to Register and FPURegister would spare a
   // few aliases, but mixing both does not look clean to me.
   // Anyway we could surely implement this differently.
 
   void GenInstrRegister(Opcode opcode,
@@ skipping 149 matching lines @@
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_MIPS_H_