Port and integrate the irregexp engine from V8

runtime/vm/flow_graph_compiler_ia32.cc

Index: runtime/vm/flow_graph_compiler_ia32.cc
diff --git a/runtime/vm/flow_graph_compiler_ia32.cc b/runtime/vm/flow_graph_compiler_ia32.cc
index 6236d5c8b4b54fd7d5662c0bbd04c395aa745a26..9bc273cc1a7ff2b0cc6284fae17a470495d9edd5 100644
--- a/runtime/vm/flow_graph_compiler_ia32.cc
+++ b/runtime/vm/flow_graph_compiler_ia32.cc
@@ -1043,10 +1043,12 @@ void FlowGraphCompiler::CompileGraph() {
   if (num_copied_params == 0) {
 #ifdef DEBUG
     ASSERT(!parsed_function().function().HasOptionalParameters());
-    const bool check_arguments = !flow_graph().IsCompiledForOsr();
+    const bool check_arguments = !flow_graph().IsCompiledForOsr() &&
+        !function.IsIrregexpFunction();

[Florian Schneider, 2014/10/01 17:04:14]

Is this necessary? IsClosureFunction implies !IsIrregexpFunction(), doesn't it?

[jgruber1, 2014/10/03 18:59:52]

Done.

 #else
     const bool check_arguments =
-        function.IsClosureFunction() && !flow_graph().IsCompiledForOsr();
+        function.IsClosureFunction() && !flow_graph().IsCompiledForOsr() &&
+        !function.IsIrregexpFunction();
 #endif
     if (check_arguments) {
       __ Comment("Check argument count");