WIP context-allocation for “this” in arrow functions

src/ast-numbering.cc

Index: src/ast-numbering.cc
diff --git a/src/ast-numbering.cc b/src/ast-numbering.cc
index c2dd70e1bbe75086a0de3e9097aac6d2b3dc49c1..60f41016030af4b27aa4571c87554d27c6514716 100644
--- a/src/ast-numbering.cc
+++ b/src/ast-numbering.cc
@@ -559,6 +559,14 @@ bool AstNumberingVisitor::Renumber(FunctionLiteral* node) {
     DisableCrankshaft(kContextAllocatedArguments);
   }
 
+  // TODO(aperez): Add support in Crankshaft for arrow functions (issue #3814).
+  if (scope->is_arrow_scope() && scope->uses_this()) {
+    DisableCrankshaft(kCapturedThis);
+  }
+  if (scope->is_function_scope() && scope->inner_uses_this()) {
+    DisableCrankshaft(kCapturedThis);
+  }
+
   VisitDeclarations(scope->declarations());
   if (scope->is_function_scope() && scope->function() != NULL) {
     // Visit the name of the named function expression.