MIPS: Patch to enhance the source code line information for profiler.

src/mips/lithium-codegen-mips.h

Index: src/mips/lithium-codegen-mips.h
diff --git a/src/mips/lithium-codegen-mips.h b/src/mips/lithium-codegen-mips.h
index 38ffb37b3cc6c9b6cdc42b42e06476197a2681df..e01cba44a784d09c98fc6b12120a26f32fb912d0 100644
--- a/src/mips/lithium-codegen-mips.h
+++ b/src/mips/lithium-codegen-mips.h
@@ -65,7 +65,8 @@ class LCodeGen BASE_EMBEDDED {
         frame_is_built_(false),
         safepoints_(info->zone()),
         resolver_(this),
-        expected_safepoint_kind_(Safepoint::kSimple) {
+        expected_safepoint_kind_(Safepoint::kSimple),
+        old_position_(RelocInfo::kNoPosition) {
     PopulateDeoptimizationLiteralsWithInlinedFunctions();
   }
 
@@ -322,6 +323,7 @@ class LCodeGen BASE_EMBEDDED {
                                               int arguments,
                                               Safepoint::DeoptMode mode);
   void RecordPosition(int position);
+  void RecordAndUpdatePosition(int position);
 
   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
   void EmitGoto(int block);
@@ -438,6 +440,8 @@ class LCodeGen BASE_EMBEDDED {
 
   Safepoint::Kind expected_safepoint_kind_;
 
+  int old_position_;
+
   class PushSafepointRegistersScope BASE_EMBEDDED {
    public:
     PushSafepointRegistersScope(LCodeGen* codegen,