Inhibit OSR for big functions.

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index 3b1fc93b5f2795130617761cd4ae9cfd5d72e993..e5d190ade934156e0e62fbde8150e853ed5956e4 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -337,7 +337,7 @@ void FullCodeGenerator::EmitBackEdgeBookkeeping(IterationStatement* stmt,
     ASSERT(back_edge_target->is_bound());
     int distance = masm_->SizeOfCodeGeneratedSince(back_edge_target);
     weight = Min(kMaxBackEdgeWeight,
-                 Max(1, distance / kBackEdgeDistanceUnit));
+                 Max(1, distance / kCodeSizeMultiplier));
   }
   EmitProfilingCounterDecrement(weight);
   __ j(positive, &ok, Label::kNear);
@@ -378,7 +378,7 @@ void FullCodeGenerator::EmitReturnSequence() {
       } else if (FLAG_weighted_back_edges) {
         int distance = masm_->pc_offset();
         weight = Min(kMaxBackEdgeWeight,
-                     Max(1, distance / kBackEdgeDistanceUnit));
+                     Max(1, distance / kCodeSizeMultiplier));
       }
       EmitProfilingCounterDecrement(weight);
       Label ok;