Switch CallConstructStub to take new.target in register.

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 55b86c03b1da3d94aa0f0ed19bfafc07a8e97158..71be512d7bc0fa3142d7c9014265eb6095f2a690 100644
--- a/src/mips/interface-descriptors-mips.cc
+++ b/src/mips/interface-descriptors-mips.cc
@@ -169,11 +169,11 @@ void CallConstructDescriptor::InitializePlatformSpecific(
   // a0 : number of arguments
   // a1 : the function to call
   // a2 : feedback vector
-  // a3 : (only if a2 is not the megamorphic symbol) slot in feedback
-  //      vector (Smi)
+  // a3 : slot in feedback vector (Smi, for RecordCallTarget)
+  // t0 : original constructor (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, a2};
+  Register registers[] = {a0, a1, t0, a2};
   data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
 }