Force context allocation for variables in generator scopes.

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index 6086645db3c2c08dc3706474d2e224792544a012..46a3a802233279a8ac211facdb8277f555dd3742 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -162,8 +162,6 @@ void FullCodeGenerator::Generate() {
   // the frame (that is done below).
   FrameScope frame_scope(masm_, StackFrame::MANUAL);
 
-  int locals_count = info->scope()->num_stack_slots();
-
   info->set_prologue_offset(masm_->pc_offset());
   {
     PredictableCodeSizeScope predictible_code_size_scope(
@@ -179,6 +177,9 @@ void FullCodeGenerator::Generate() {
   }
 
   { Comment cmnt(masm_, "[ Allocate locals");
+    int locals_count = info->scope()->num_stack_slots();
+    // Generators allocate locals, if any, in context slots.
+    ASSERT(!info->function()->is_generator() || locals_count == 0);
     for (int i = 0; i < locals_count; i++) {
       __ push(ip);
     }