Collect type profile for DevTools.

src/interpreter/bytecode-array-builder.h

Index: src/interpreter/bytecode-array-builder.h
diff --git a/src/interpreter/bytecode-array-builder.h b/src/interpreter/bytecode-array-builder.h
index 6c09f5cdf40cdd6ae59bdd1758dc87bb41302b65..c5f77d44f1fb9e45a701ee664004ecf08d96f6a5 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -137,6 +137,11 @@ class V8_EXPORT_PRIVATE BytecodeArrayBuilder final
       Register object, Register name, DataPropertyInLiteralFlags flags,
       int feedback_slot);
 
+  // Collect type information for developer tools. The value for which we
+  // record the type is stored in the accumulator.
+  // TODO(franzih): Do not pass the name, instead use the source position.

[rmcilroy, 2017/03/13 10:50:59]

Any not to use source position now? This would probably make the changes in
VisitAssignment much simpler (since the source position could be an immediate,
so no need to allocate a register and get the name differently depending on LHS.
Fine with landing this as-is if you want to iterate before doing this though. 

[Franzi, 2017/03/13 12:01:56]

I'll land as is to keep CL somewhat shorter. 

+  BytecodeArrayBuilder& CollectTypeProfile(Register name, int feedback_slot);
+
   // Store a property named by a property name. The value to be stored should be
   // in the accumulator.
   BytecodeArrayBuilder& StoreNamedProperty(Register object,