[heap] Remove max executable size configuration.

src/arm/assembler-arm.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 1705 matching lines @@
   // to the constant pool. These records are temporarily stored in a separate
   // buffer until a constant pool is emitted.
   // If every instruction in a long sequence is accessing the pool, we need one
   // pending relocation entry per instruction.
 
   // The buffers of pending constant pool entries.
   std::vector<ConstantPoolEntry> pending_32_bit_constants_;
   std::vector<ConstantPoolEntry> pending_64_bit_constants_;
 
  private:
+  // Avoid overflows for displacements etc.
+  static const int kMaximalBufferSize = 512 * MB;
+
   int next_buffer_check_;  // pc offset of next buffer check
 
   // Constant pool generation
   // Pools are emitted in the instruction stream, preferably after unconditional
   // jumps or after returns from functions (in dead code locations).
   // If a long code sequence does not contain unconditional jumps, it is
   // necessary to emit the constant pool before the pool gets too far from the
   // location it is accessed from. In this case, we emit a jump over the emitted
   // constant pool.
   // Constants in the pool may be addresses of functions that gets relocated;
@@ skipping 66 matching lines @@
 
   void Emit(Address addr);
   void FlushICache(Isolate* isolate);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_