[stubs] Port CreateWeakCellStub to turbofan

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index 83096044cc6a2a7161e3203efe34a53a66f8c841..39aa95bfb5f77414458a3ce0508fb4e737182a0f 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -220,6 +220,8 @@ class CodeStubAssembler : public compiler::CodeAssembler {
   // Store the Map of an HeapObject.
   compiler::Node* StoreMapNoWriteBarrier(compiler::Node* object,
                                          compiler::Node* map);
+  compiler::Node* StoreObjectFieldRoot(compiler::Node* object, int offset,
+                                       Heap::RootListIndex root);
   // Store an array element to a FixedArray.
   compiler::Node* StoreFixedArrayElement(
       compiler::Node* object, compiler::Node* index, compiler::Node* value,
@@ -485,6 +487,12 @@ class CodeStubAssembler : public compiler::CodeAssembler {
                       CodeStubAssembler::Label* use_cache,
                       CodeStubAssembler::Label* use_runtime);
 
+  // Create a new weak cell with a specified value and install it into a
+  // feedback vector.
+  compiler::Node* CreateWeakCellInFeedbackVector(
+      compiler::Node* feedback_vector, compiler::Node* slot,
+      compiler::Node* value);
+
  private:
   compiler::Node* ElementOffsetFromIndex(compiler::Node* index,
                                          ElementsKind kind, ParameterMode mode,