[heap] Remove dead write write barrier counter code

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index ebccca2e6367d8885d4e2916d9f0ed5cb70e78ea..c42728a1dd86ab31228866dd7957aadcdadf15c9 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -3183,16 +3183,6 @@ void RecordWriteStub::CheckNeedsToInformIncrementalMarker(
   Label need_incremental;
   Label need_incremental_pop_scratch;
 
-  __ And(regs_.scratch0(), regs_.object(), Operand(~Page::kPageAlignmentMask));
-  __ lw(regs_.scratch1(),
-        MemOperand(regs_.scratch0(),
-                   MemoryChunk::kWriteBarrierCounterOffset));
-  __ Subu(regs_.scratch1(), regs_.scratch1(), Operand(1));
-  __ sw(regs_.scratch1(),
-         MemOperand(regs_.scratch0(),
-                    MemoryChunk::kWriteBarrierCounterOffset));
-  __ Branch(&need_incremental, lt, regs_.scratch1(), Operand(zero_reg));
-
   // Let's look at the color of the object:  If it is not black we don't have
   // to inform the incremental marker.
   __ JumpIfBlack(regs_.object(), regs_.scratch0(), regs_.scratch1(), &on_black);