X87: [builtins] Sanitize the machinery around Construct calls.

src/x87/interface-descriptors-x87.cc

Index: src/x87/interface-descriptors-x87.cc
diff --git a/src/x87/interface-descriptors-x87.cc b/src/x87/interface-descriptors-x87.cc
index 48de9d5c3bda6c73efd7e0e8cd5f50b39408c07a..6b45523424367e647fd6b0bf91562c8d2cc6d99a 100644
--- a/src/x87/interface-descriptors-x87.cc
+++ b/src/x87/interface-descriptors-x87.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};