Provide call counts for constructor calls, surface them as a vector IC.

src/mips/interface-descriptors-mips.cc

Index: src/mips/interface-descriptors-mips.cc
diff --git a/src/mips/interface-descriptors-mips.cc b/src/mips/interface-descriptors-mips.cc
index 2b9a1b447dca9ea2aae3753e4d37e984a46472bc..2f063d81141365a7656e4096a8b222ea7eeb30c9 100644
--- a/src/mips/interface-descriptors-mips.cc
+++ b/src/mips/interface-descriptors-mips.cc
@@ -188,16 +188,15 @@ void CallFunctionWithFeedbackAndVectorDescriptor::InitializePlatformSpecific(
 }
 
 
-void CallConstructDescriptor::InitializePlatformSpecific(
+void ConstructDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // a0 : number of arguments
   // a1 : the function to call
   // a2 : feedback vector
   // a3 : slot in feedback vector (Smi, for RecordCallTarget)
-  // t0 : new target (for IsSuperConstructorCall)
   // TODO(turbofan): So far we don't gather type feedback and hence skip the
   // slot parameter, but ArrayConstructStub needs the vector to be undefined.
-  Register registers[] = {a0, a1, t0, a2};
+  Register registers[] = {a0, a1, a2, a3};
   data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
 }