Fix load of potentially eval-shadowed let bindings.

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index d45a9cdaeea3ab3725152056bb3a87ecde43e77d..b66711fb7693fa82cd8dd33c01e67380092dee90 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -1207,10 +1207,16 @@ void FullCodeGenerator::EmitDynamicLookupFastCase(Variable* var,
   } else if (var->mode() == Variable::DYNAMIC_LOCAL) {
     Variable* local = var->local_if_not_shadowed();
     __ mov(eax, ContextSlotOperandCheckExtensions(local, slow));
-    if (local->mode() == Variable::CONST) {
+    if (local->mode() == Variable::CONST ||
+        local->mode() == Variable::LET) {
       __ cmp(eax, isolate()->factory()->the_hole_value());
       __ j(not_equal, done);
-      __ mov(eax, isolate()->factory()->undefined_value());
+      if (local->mode() == Variable::CONST) {
+        __ mov(eax, isolate()->factory()->undefined_value());
+      } else {  // Variable::LET
+        __ push(Immediate(var->name()));
+        __ CallRuntime(Runtime::kThrowReferenceError, 1);
+      }
     }
     __ jmp(done);
   }