Make instruction counter in simulators 64-bit (issue 22302).

runtime/vm/simulator_mips.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Declares a Simulator for MIPS instructions if we are not generating a native
 // MIPS binary. This Simulator allows us to run and debug MIPS code generation
 // on regular desktop machines.
 // Dart calls into generated code by "calling" the InvokeDartCode stub,
 // which will start execution in the Simulator or forwards to the real entry
 // on a MIPS HW platform.
@@ skipping 73 matching lines @@
   }
 
   bool test_fcsr_bit(uint32_t cc) {
     return fcsr_ & (1 << cc);
   }
 
   // Accessor to the internal simulator stack top.
   uword StackTop() const;
 
   // Accessor to the instruction counter.
-  intptr_t get_icount() const { return icount_; }
+  uint64_t get_icount() const { return icount_; }
 
   // The isolate's top_exit_frame_info refers to a Dart frame in the simulator
   // stack. The simulator's top_exit_frame_info refers to a C++ frame in the
   // native stack.
   uword top_exit_frame_info() const { return top_exit_frame_info_; }
   void set_top_exit_frame_info(uword value) { top_exit_frame_info_ = value; }
 
   // Call on program start.
   static void InitOnce();
 
@@ skipping 47 matching lines @@
   int32_t hi_reg_;
   int32_t lo_reg_;
 
   int32_t registers_[kNumberOfCpuRegisters];
   int32_t fregisters_[kNumberOfFRegisters];
   int32_t fcsr_;
   uword pc_;
 
   // Simulator support.
   char* stack_;
-  intptr_t icount_;
+  uint64_t icount_;
   bool delay_slot_;
   SimulatorSetjmpBuffer* last_setjmp_buffer_;
   uword top_exit_frame_info_;
 
   // Registered breakpoints.
   Instr* break_pc_;
   int32_t break_instr_;
 
   // Illegal memory access support.
   static bool IsIllegalAddress(uword addr) {
@@ skipping 80 matching lines @@
   }
 
   friend class SimulatorDebugger;
   friend class SimulatorSetjmpBuffer;
   DISALLOW_COPY_AND_ASSIGN(Simulator);
 };
 
 }  // namespace dart
 
 #endif  // VM_SIMULATOR_MIPS_H_