[builtins] Sanitize the machinery around Construct calls.

src/ia32/interface-descriptors-ia32.cc

Index: src/ia32/interface-descriptors-ia32.cc
diff --git a/src/ia32/interface-descriptors-ia32.cc b/src/ia32/interface-descriptors-ia32.cc
index fcb0766052db80428489a857bded2505385724a2..febea84408b69718649ce0b93a2206146133468c 100644
--- a/src/ia32/interface-descriptors-ia32.cc
+++ b/src/ia32/interface-descriptors-ia32.cc
@@ -210,6 +210,16 @@ void CallTrampolineDescriptor::InitializePlatformSpecific(
 }
 
 
+void ConstructTrampolineDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  // eax : number of arguments
+  // edx : the new target
+  // edi : the target to call
+  Register registers[] = {edi, edx, eax};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+
 void RegExpConstructResultDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {ecx, ebx, eax};