Remove obsolete LiveRange::FirstPosWithHint helper.

src/lithium-allocator.h

Index: src/lithium-allocator.h
diff --git a/src/lithium-allocator.h b/src/lithium-allocator.h
index 0cd5ae0e8e803c5fed7d256c357a91fa00a58413..0300212f3103bdc23f8f2372e8a51da3a86ad903 100644
--- a/src/lithium-allocator.h
+++ b/src/lithium-allocator.h
@@ -328,10 +328,10 @@ class LiveRange: public ZoneObject {
     return assigned_register_ != kInvalidAssignment;
   }
   bool IsSpilled() const { return spilled_; }
-  UsePosition* FirstPosWithHint() const;
 
   LOperand* FirstHint() const {
-    UsePosition* pos = FirstPosWithHint();
+    UsePosition* pos = first_pos_;
+    while (pos != NULL && !pos->HasHint()) pos = pos->next();
     if (pos != NULL) return pos->hint();
     return NULL;
   }