Drop IsPregenerated() and allow_stub_calls flag.

src/x64/macro-assembler-x64.h

 // Copyright 2012 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 1375 matching lines @@
 
   // Print a message to stdout and abort execution.
   void Abort(BailoutReason msg);
 
   // Check that the stack is aligned.
   void CheckStackAlignment();
 
   // Verify restrictions about code generated in stubs.
   void set_generating_stub(bool value) { generating_stub_ = value; }
   bool generating_stub() { return generating_stub_; }
-  void set_allow_stub_calls(bool value) { allow_stub_calls_ = value; }
-  bool allow_stub_calls() { return allow_stub_calls_; }
   void set_has_frame(bool value) { has_frame_ = value; }
   bool has_frame() { return has_frame_; }
   inline bool AllowThisStubCall(CodeStub* stub);
 
   static int SafepointRegisterStackIndex(Register reg) {
     return SafepointRegisterStackIndex(reg.code());
   }
 
   // Activation support.
   void EnterFrame(StackFrame::Type type);
@@ skipping 29 matching lines @@
                                         Register scratch1, Label* found);
 
  private:
   // Order general registers are pushed by Pushad.
   // rax, rcx, rdx, rbx, rsi, rdi, r8, r9, r11, r14, r15.
   static const int kSafepointPushRegisterIndices[Register::kNumRegisters];
   static const int kNumSafepointSavedRegisters = 11;
   static const int kSmiShift = kSmiTagSize + kSmiShiftSize;
 
   bool generating_stub_;
-  bool allow_stub_calls_;
   bool has_frame_;
   bool root_array_available_;
 
   // Returns a register holding the smi value. The register MUST NOT be
   // modified. It may be the "smi 1 constant" register.
   Register GetSmiConstant(Smi* value);
 
   intptr_t RootRegisterDelta(ExternalReference other);
 
   // Moves the smi value to the destination register.
@@ skipping 154 matching lines @@
     masm->popfq();                                                           \
   }                                                                          \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_