Get rid of the "spare buffer" cache.

src/arm/assembler-arm.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 3184 matching lines @@
   // code.
   RecordRelocInfo(RelocInfo::CONST_POOL, static_cast<intptr_t>(size));
 }
 
 
 void Assembler::GrowBuffer() {
   if (!own_buffer_) FATAL("external code buffer is too small");
 
   // Compute new buffer size.
   CodeDesc desc;  // the new buffer
-  if (buffer_size_ < 4*KB) {
-    desc.buffer_size = 4*KB;
+  if (buffer_size_ == 0) {
+    desc.buffer_size = kMinimalBufferSize;
   } else if (buffer_size_ < 1*MB) {
     desc.buffer_size = 2*buffer_size_;
   } else {
     desc.buffer_size = buffer_size_ + 1*MB;
   }
   CHECK_GT(desc.buffer_size, 0);  // no overflow
 
   // Set up new buffer.
   desc.buffer = NewArray<byte>(desc.buffer_size);
 
   desc.instr_size = pc_offset();
   desc.reloc_size = (buffer_ + buffer_size_) - reloc_info_writer.pos();
 
   // Copy the data.
   int pc_delta = desc.buffer - buffer_;
   int rc_delta = (desc.buffer + desc.buffer_size) - (buffer_ + buffer_size_);
   MemMove(desc.buffer, buffer_, desc.instr_size);
   MemMove(reloc_info_writer.pos() + rc_delta, reloc_info_writer.pos(),
           desc.reloc_size);
 
   // Switch buffers.

[Igor Sheludko, 2014/08/06 16:52:08]

Obsolete comment.

   DeleteArray(buffer_);
   buffer_ = desc.buffer;
   buffer_size_ = desc.buffer_size;
   pc_ += pc_delta;
   reloc_info_writer.Reposition(reloc_info_writer.pos() + rc_delta,
                                reloc_info_writer.last_pc() + pc_delta);
 
   // None of our relocation types are pc relative pointing outside the code
   // buffer nor pc absolute pointing inside the code buffer, so there is no need
   // to relocate any emitted relocation entries.
@@ skipping 525 matching lines @@
       assm->instr_at_put(
           rinfo.pc(), Assembler::SetLdrRegisterImmediateOffset(instr, offset));
     }
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM