[runtime] Support Proxy setPrototypeOf trap

src/ast/variables.h

Index: src/ast/variables.h
diff --git a/src/ast/variables.h b/src/ast/variables.h
index 4057d2b5f629b809a67302ec8e946ac6ec714b52..ad6b9bdbe7a646263f9872762c94ce7169d28090 100644
--- a/src/ast/variables.h
+++ b/src/ast/variables.h
@@ -18,7 +18,7 @@ namespace internal {
 
 class ClassVariable;
 
-class Variable: public ZoneObject {
+class Variable : public ZoneObject {
  public:
   enum Kind { NORMAL, FUNCTION, CLASS, THIS, ARGUMENTS };
 
@@ -43,9 +43,7 @@ class Variable: public ZoneObject {
   bool has_forced_context_allocation() const {
     return force_context_allocation_;
   }
-  void ForceContextAllocation() {
-    force_context_allocation_ = true;
-  }
+  void ForceContextAllocation() { force_context_allocation_ = true; }
   bool is_used() { return is_used_; }
   void set_is_used() { is_used_ = true; }
   MaybeAssignedFlag maybe_assigned() const { return maybe_assigned_; }