[interpreter] Avoid tier-up when there is an OSR activation.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 304807bc626d36356a86d3cc7e13ac4ba721822a..de6c255c1960bb793d953e6cd37d6393e8b54e97 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -851,8 +851,14 @@ class InterpreterActivationsFinder : public ThreadVisitor,
     JavaScriptFrameIterator it(isolate, top);
     for (; !it.done(); it.Advance()) {
       JavaScriptFrame* frame = it.frame();
-      if (!frame->is_interpreted()) continue;
-      if (frame->function()->shared() == shared_) {
+      if (FLAG_turbo_from_bytecode && FLAG_ignition_osr &&
+          frame->is_optimized() && frame->function()->shared() == shared_) {
+        // If we are able to optimize functions directly from bytecode, then
+        // there might be optimized OSR code active on the stack that is not
+        // reachable through a function. We count this as an activation.
+        has_activations_ = true;
+      }
+      if (frame->is_interpreted() && frame->function()->shared() == shared_) {
         has_activations_ = true;
         activation_pc_address = frame->pc_address();
       }