[heap] Remove max executable size configuration.

src/ppc/assembler-ppc.cc

 // 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 1966 matching lines @@
     desc.buffer_size = 4 * KB;
   } else if (buffer_size_ < 1 * MB) {
     desc.buffer_size = 2 * buffer_size_;
   } else {
     desc.buffer_size = buffer_size_ + 1 * MB;
   }
   int space = buffer_space() + (desc.buffer_size - buffer_size_);
   if (space < needed) {
     desc.buffer_size += needed - space;
   }
-  CHECK_GT(desc.buffer_size, 0);  // no overflow
+
+  // Some internal data structures overflow for very large buffers,
+  // they must ensure that kMaximalBufferSize is not too large.
+  if (desc.buffer_size > kMaximalBufferSize ||
+      static_cast<size_t>(desc.buffer_size) >
+          isolate_data().max_old_generation_size_) {
+    V8::FatalProcessOutOfMemory("Assembler::GrowBuffer");
+  }
 
   // Set up new buffer.
   desc.buffer = NewArray<byte>(desc.buffer_size);
   desc.origin = this;
 
   desc.instr_size = pc_offset();
   desc.reloc_size = (buffer_ + buffer_size_) - reloc_info_writer.pos();
 
   // Copy the data.
   intptr_t pc_delta = desc.buffer - buffer_;
@@ skipping 137 matching lines @@
 }
 
 void PatchingAssembler::FlushICache(Isolate* isolate) {
   Assembler::FlushICache(isolate, buffer_, buffer_size_ - kGap);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC