Fix crash bug when loading const variable in the presence of eval....

src/codegen-arm.cc

Index: src/codegen-arm.cc
===================================================================
--- src/codegen-arm.cc	(revision 1710)
+++ src/codegen-arm.cc	(working copy)
@@ -2446,6 +2446,10 @@
                                                  r1,
                                                  r2,
                                                  &slow));
+        if (potential_slot->var()->mode() == Variable::CONST) {
+          __ cmp(r0, Operand(Factory::the_hole_value()));
+          __ mov(r0, Operand(Factory::undefined_value()), LeaveCC, eq);
+        }
         // There is always control flow to slow from
         // ContextSlotOperandCheckExtensions.
         done.Jump();