[heap] Remove dead write write barrier counter code

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index c30cfd7f4bbbd42e8a934e1f4a2053bb4ee9d5df..bf81bf30c8caea5a1646bc45610aac4f4afac4e6 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -3186,16 +3186,6 @@ void RecordWriteStub::CheckNeedsToInformIncrementalMarker(
   Label need_incremental;
   Label need_incremental_pop_scratch;
 
-  __ And(regs_.scratch0(), regs_.object(), Operand(~Page::kPageAlignmentMask));
-  __ ld(regs_.scratch1(),
-        MemOperand(regs_.scratch0(),
-                   MemoryChunk::kWriteBarrierCounterOffset));
-  __ Dsubu(regs_.scratch1(), regs_.scratch1(), Operand(1));
-  __ sd(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);