Get rid of the "spare buffer" cache.

src/x87/assembler-x87.cc

Index: src/x87/assembler-x87.cc
diff --git a/src/x87/assembler-x87.cc b/src/x87/assembler-x87.cc
index cb40dac65167426fc64e744cd8d099d474c7af27..7061053e6efc8bd6964ca9dd4c9a51a82a2b615a 100644
--- a/src/x87/assembler-x87.cc
+++ b/src/x87/assembler-x87.cc
@@ -1910,13 +1910,7 @@ void Assembler::GrowBuffer() {
   MemMove(rc_delta + reloc_info_writer.pos(), reloc_info_writer.pos(),
           desc.reloc_size);
 
-  // Switch buffers.
-  if (isolate()->assembler_spare_buffer() == NULL &&
-      buffer_size_ == kMinimalBufferSize) {
-    isolate()->set_assembler_spare_buffer(buffer_);
-  } else {
-    DeleteArray(buffer_);
-  }
+  DeleteArray(buffer_);
   buffer_ = desc.buffer;
   buffer_size_ = desc.buffer_size;
   pc_ += pc_delta;