Generate a custom OSR entrypoint for OSR compiles on all platforms, and transition to optimized cod…

src/hydrogen-osr.cc

Index: src/hydrogen-osr.cc
diff --git a/src/hydrogen-osr.cc b/src/hydrogen-osr.cc
index bf6233bb41d91cda9f3f8cf38629b3c78aa1c4a7..6b1df1e7a5b102106ab8f6a083503db1e28bcbc4 100644
--- a/src/hydrogen-osr.cc
+++ b/src/hydrogen-osr.cc
@@ -80,7 +80,8 @@ HBasicBlock* HOsrBuilder::BuildPossibleOsrLoopEntry(
   osr_values_ = new(zone) ZoneList<HUnknownOSRValue*>(length, zone);
 
   for (int i = 0; i < first_expression_index; ++i) {
-    HUnknownOSRValue* osr_value = builder_->Add<HUnknownOSRValue>();
+    HUnknownOSRValue* osr_value
+        = builder_->Add<HUnknownOSRValue>(environment, i);
     environment->Bind(i, osr_value);
     osr_values_->Add(osr_value, zone);
   }
@@ -88,12 +89,21 @@ HBasicBlock* HOsrBuilder::BuildPossibleOsrLoopEntry(
   if (first_expression_index != length) {
     environment->Drop(length - first_expression_index);
     for (int i = first_expression_index; i < length; ++i) {
-      HUnknownOSRValue* osr_value = builder_->Add<HUnknownOSRValue>();
+      HUnknownOSRValue* osr_value
+          = builder_->Add<HUnknownOSRValue>(environment, i);
       environment->Push(osr_value);
       osr_values_->Add(osr_value, zone);
     }
   }
 
+  unoptimized_frame_slots_ =
+      environment->local_count() + environment->push_count();
+
+  // Keep a copy of the old environment, since the OSR values need it
+  // to figure out where exactly they are located in the unoptimized frame.
+  environment = environment->Copy();
+  builder_->current_block()->UpdateEnvironment(environment);
+
   builder_->Add<HSimulate>(osr_entry_id);
   builder_->Add<HOsrEntry>(osr_entry_id);
   HContext* context = builder_->Add<HContext>();