Enables V8 integration with the Intel VTune performance analysis tool. This allows the VTune profi…

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
===================================================================
--- src/x64/lithium-codegen-x64.cc	(revision 12182)
+++ src/x64/lithium-codegen-x64.cc	(working copy)
@@ -244,6 +244,14 @@
       Comment(";;; @%d: %s.", current_instruction_, instr->Mnemonic());
       instr->CompileToNative(this);
     }
+#ifdef ENABLE_VTUNE_JIT_INTERFACE
+    if (instr->HasPointerMap()) {
+      LPointerMap* pointers = instr->pointer_map();
+      if (pointers->position() != RelocInfo::kNoPosition) {
+        RecordPosition(pointers->position());
+      }
+    }
+#endif
   }
   EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
   return !is_aborted();