[es6] Correct parsing of regular expression literal flags.

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 d4755a6dde21d19ea87595b03e32f4bf4747e1dd..f857fc48e3d6b9cfb953ec0b8c5e40cde3081482 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -1042,12 +1042,9 @@ void BytecodeGenerator::VisitLiteral(Literal* expr) {
 void BytecodeGenerator::VisitRegExpLiteral(RegExpLiteral* expr) {
   // Materialize a regular expression literal.
   TemporaryRegisterScope temporary_register_scope(builder());
-  Register flags = temporary_register_scope.NewRegister();
   builder()
-      ->LoadLiteral(expr->flags())
-      .StoreAccumulatorInRegister(flags)
-      .LoadLiteral(expr->pattern())
-      .CreateRegExpLiteral(expr->literal_index(), flags);
+      ->LoadLiteral(expr->pattern())
+      .CreateRegExpLiteral(expr->literal_index(), expr->flags());
   execution_result()->SetResultInAccumulator();
 }