MIPS: Fix r19360 "Improve positions tracking inside the HGraphBuilder."

src/mips/lithium-mips.h

Index: src/mips/lithium-mips.h
diff --git a/src/mips/lithium-mips.h b/src/mips/lithium-mips.h
index 6cc13bf4c247fc7bf288f7c2caadc0957bd43de6..258502dc263613766aaab92f452ec411bb8b601e 100644
--- a/src/mips/lithium-mips.h
+++ b/src/mips/lithium-mips.h
@@ -2554,7 +2554,6 @@ class LChunkBuilder V8_FINAL : public LChunkBuilderBase {
         current_block_(NULL),
         next_block_(NULL),
         allocator_(allocator),
-        position_(RelocInfo::kNoPosition),
         instruction_pending_deoptimization_environment_(NULL),
         pending_deoptimization_ast_id_(BailoutId::None()) { }
 
@@ -2690,7 +2689,6 @@ class LChunkBuilder V8_FINAL : public LChunkBuilderBase {
   HBasicBlock* current_block_;
   HBasicBlock* next_block_;
   LAllocator* allocator_;
-  int position_;
   LInstruction* instruction_pending_deoptimization_environment_;
   BailoutId pending_deoptimization_ast_id_;