Drop IsPregenerated() and allow_stub_calls flag.

test/cctest/test-macro-assembler-ia32.cc

 // 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 44 matching lines @@
   // Allocate an executable page of memory.
   size_t actual_size;
   byte* buffer = static_cast<byte*>(OS::Allocate(Assembler::kMinimalBufferSize,
                                                  &actual_size,
                                                  true));
   CHECK(buffer);
   Isolate* isolate = CcTest::i_isolate();
   HandleScope handles(isolate);
   MacroAssembler assembler(isolate, buffer, static_cast<int>(actual_size));
   MacroAssembler* masm = &assembler;  // Create a pointer for the __ macro.
-  masm->set_allow_stub_calls(false);
   __ push(ebx);
   __ push(edx);
   __ sub(esp, Immediate(1 * kPointerSize));
   Label exit;
 
   // Test 1.
   __ mov(eax, Immediate(1));  // Test number.
   __ mov(Operand(esp, 0 * kPointerSize), Immediate(0));
   __ mov(ebx, Immediate(-1));
   __ Store(ebx, Operand(esp, 0 * kPointerSize), Representation::UInteger8());
@@ skipping 55 matching lines @@
   __ ret(0);
 
   CodeDesc desc;
   masm->GetCode(&desc);
   // Call the function from C++.
   int result = FUNCTION_CAST<F0>(buffer)();
   CHECK_EQ(0, result);
 }
 
 #undef __