Treat a '!' preceding a function literal as eager-compile hint.

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 262ce278cf94cf256b5424a5261faa3f2f3cb121..1fff14f9485867aa84569d976cc71948c2886069 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -424,6 +424,7 @@ Expression* Parser::BuildUnaryExpression(Expression* expression,
     return factory()->NewBinaryOperation(
         Token::BIT_XOR, expression, factory()->NewNumberLiteral(~0, pos), pos);
   }
+
   return factory()->NewUnaryOperation(op, expression, pos);
 }
 
@@ -2531,7 +2532,8 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
   }
 
   FunctionLiteral::EagerCompileHint eager_compile_hint =
-      function_state_->next_function_is_parenthesized()
+      (function_state_->next_function_is_parenthesized() ||
+       function_state_->next_function_is_exclaimed())
           ? FunctionLiteral::kShouldEagerCompile
           : default_eager_compile_hint();