Port and integrate the irregexp engine from V8

runtime/vm/flow_graph_compiler_mips.cc

Index: runtime/vm/flow_graph_compiler_mips.cc
diff --git a/runtime/vm/flow_graph_compiler_mips.cc b/runtime/vm/flow_graph_compiler_mips.cc
index 8ed3f907c19170adc7705b5cda681125b59f1aa1..ff5595c1e114830fd61dcd1a8d68a7af34c0ea88 100644
--- a/runtime/vm/flow_graph_compiler_mips.cc
+++ b/runtime/vm/flow_graph_compiler_mips.cc
@@ -1074,10 +1074,12 @@ 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 18:59:53]

Done.

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