[interpreter] Add ReThrow bytecode for try-finally support.

src/interpreter/bytecode-generator.cc

Index: src/interpreter/bytecode-generator.cc
diff --git a/src/interpreter/bytecode-generator.cc b/src/interpreter/bytecode-generator.cc
index b588950309a682f94d61d5ae6481c61069396c9f..02b84d1ada27cac4a1e4dfdbd6e0fe0cef65120e 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -209,8 +209,7 @@ class BytecodeGenerator::ControlScopeForTopLevel final
         generator()->builder()->Return();
         return true;
       case CMD_RETHROW:
-        // TODO(mstarzinger): Should be a ReThrow instead.
-        generator()->builder()->Throw();
+        generator()->builder()->ReThrow();
         return true;
     }
     return false;
@@ -291,7 +290,7 @@ class BytecodeGenerator::ControlScopeForTryCatch final
  public:
   ControlScopeForTryCatch(BytecodeGenerator* generator,
                           TryCatchBuilder* try_catch_builder)
-      : ControlScope(generator), try_catch_builder_(try_catch_builder) {}
+      : ControlScope(generator) {}
 
  protected:
   bool Execute(Command command, Statement* statement) override {
@@ -301,16 +300,11 @@ class BytecodeGenerator::ControlScopeForTryCatch final
       case CMD_RETURN:
         break;
       case CMD_RETHROW:
-        // TODO(mstarzinger): Test and implement this!
-        USE(try_catch_builder_);
-        UNIMPLEMENTED();
+        generator()->builder()->ReThrow();
         return true;
     }
     return false;
   }
-
- private:
-  TryCatchBuilder* try_catch_builder_;
 };