[heap] Remove max executable size configuration.

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 1958 matching lines @@
 
   void EmitForbiddenSlotInstruction() {
     if (IsPrevInstrCompactBranch()) {
       nop();
     }
   }
 
   inline void CheckTrampolinePoolQuick(int extra_instructions = 0);
 
  private:
+  // Avoid overflows for displacements etc.
+  static const int kMaximalBufferSize = 512 * MB;
+
   // Buffer size and constant pool distance are checked together at regular
   // intervals of kBufferCheckInterval emitted bytes.
   static constexpr int kBufferCheckInterval = 1 * KB / 2;
 
   // Code generation.
   // The relocation writer's position is at least kGap bytes below the end of
   // the generated instructions. This is so that multi-instruction sequences do
   // not have to check for overflow. The same is true for writes of large
   // relocation info entries.
   static constexpr int kGap = 32;
@@ skipping 271 matching lines @@
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM_ASSEMBLER_MIPS_H_