[turbofan] Elide checkpoint before {CreateLiteralObject}.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2675673002
Cr-Commit-Position: refs/heads/master@{#42887}

src/compiler/bytecode-graph-builder.cc

@@ -1213,7 +1213,6 @@ void BytecodeGraphBuilder::VisitCreateArrayLiteral() {
 }
 
 void BytecodeGraphBuilder::VisitCreateObjectLiteral() {
-  PrepareEagerCheckpoint();
   Handle<BoilerplateDescription> constant_properties =
       Handle<BoilerplateDescription>::cast(
           bytecode_iterator().GetConstantForIndexOperand(0));