Fix HType handling for HConstant with external references.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 6b518475d2fe5b637af65b735631848969b80986..f19f458d5358a6ad2154a2ec4ceb13a963a1a8b4 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -2741,7 +2741,8 @@ HConstant::HConstant(double double_value,
 
 
 HConstant::HConstant(ExternalReference reference)
-  : has_smi_value_(false),
+  : HTemplateInstruction(HType::None()),
+    has_smi_value_(false),
     has_int32_value_(false),
     has_double_value_(false),
     has_external_reference_value_(true),
@@ -2750,7 +2751,6 @@ HConstant::HConstant(ExternalReference reference)
     is_cell_(false),
     boolean_value_(true),
     external_reference_value_(reference) {
-  set_type(HType::None());
   Initialize(Representation::External());
 }