[interpreter] Implement OSR graph construction from bytecode.

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index 5e0dbd9b46f52dcfdc197ddb3c5fb6b0f23ffe36..978eedc5287e2ccc0fd02a7384934b602dbdb884 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -1803,6 +1803,7 @@ void PipelineImpl::AllocateRegisters(const RegisterConfiguration* config,
 
   data->InitializeRegisterAllocationData(config, descriptor);
   if (info()->is_osr()) {
+    AllowHandleDereference allow_deref;

[Jarin, 2016/07/26 14:46:36]

Out of curiosity, why is this needed?

[Michael Starzinger, 2016/07/26 14:58:51]

The constructor of {OsrHelper} dereferences the {SharedFunctionInfo} and the
{BytecodeArray} to compute frame size and parameter count. For the non-Ignition
case we were relying on scope analysis information, which is not available for
the {BytecodeGraphBuilder}. Note that OSR code is never compiled concurrently.

     OsrHelper osr_helper(info());
     osr_helper.SetupFrame(data->frame());
   }