Support %_IsConstructCall in Crankshaft pipeline.

src/ia32/lithium-codegen-ia32.h

Index: src/ia32/lithium-codegen-ia32.h
diff --git a/src/ia32/lithium-codegen-ia32.h b/src/ia32/lithium-codegen-ia32.h
index f0379c02e3da708d191501224a8953a19e7d684c..3782208336d6b17791993e8776c5eed8cc05a5e8 100644
--- a/src/ia32/lithium-codegen-ia32.h
+++ b/src/ia32/lithium-codegen-ia32.h
@@ -229,6 +229,11 @@ class LCodeGen BASE_EMBEDDED {
                          Label* is_not_object,
                          Label* is_object);
 
+  // Emits optimized code for %_IsConstructCall().
+  // Caller should branch on equal condition.
+  void EmitIsConstructCall(Register temp);
+
+
   LChunk* const chunk_;
   MacroAssembler* const masm_;
   CompilationInfo* const info_;