[turbofan] Decouple OSR entry from {OsrPoll} bytecode.

src/compiler/bytecode-graph-builder.h

Index: src/compiler/bytecode-graph-builder.h
diff --git a/src/compiler/bytecode-graph-builder.h b/src/compiler/bytecode-graph-builder.h
index d87fac9e8166f0ee00573c83f6c04eabe126aef0..148796393ee84115a304c5ec65f24fae612d8560 100644
--- a/src/compiler/bytecode-graph-builder.h
+++ b/src/compiler/bytecode-graph-builder.h
@@ -170,6 +170,10 @@ class BytecodeGraphBuilder {
   // Simulates control flow that exits the function body.
   void MergeControlToLeaveFunction(Node* exit);
 
+  // Builds entry points that are used by OSR deconstruction.
+  void BuildOSRLoopEntryPoint(int current_offset);
+  void BuildOSRNormalEntryPoint();
+
   // Builds loop exit nodes for every exited loop between the current bytecode
   // offset and {target_offset}.
   void BuildLoopExitsForBranch(int target_offset);