[builtins] Sanitize the machinery around Construct calls.

src/mips64/interface-descriptors-mips64.cc

Index: src/mips64/interface-descriptors-mips64.cc
diff --git a/src/mips64/interface-descriptors-mips64.cc b/src/mips64/interface-descriptors-mips64.cc
index 9421c9a935fc6ad6e679d1648d4fef7b9813086b..51d1156decfdd4cbf01a4344d3c254823ae214f7 100644
--- a/src/mips64/interface-descriptors-mips64.cc
+++ b/src/mips64/interface-descriptors-mips64.cc
@@ -204,6 +204,16 @@ void CallTrampolineDescriptor::InitializePlatformSpecific(
 }
 
 
+void ConstructTrampolineDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  // a1: target
+  // a3: new target
+  // a0: number of arguments
+  Register registers[] = {a1, a3, a0};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+
 void RegExpConstructResultDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {a2, a1, a0};