PPC: [Proxies] Support constructable proxy as new.target (reland)

src/ppc/builtins-ppc.cc

Index: src/ppc/builtins-ppc.cc
diff --git a/src/ppc/builtins-ppc.cc b/src/ppc/builtins-ppc.cc
index f6a92c3f921d210c1202c3734a1a56d4df4068e8..c69b17915abe036c6ca66c6f9b93ee1168cda3b2 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -1776,10 +1776,9 @@ void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- r3 : the number of arguments (not including the receiver)
   //  -- r4 : the constructor to call (checked to be a JSFunction)
-  //  -- r6 : the new target (checked to be a JSFunction)
+  //  -- r6 : the new target (checked to be a constructor)
   // -----------------------------------
   __ AssertFunction(r4);
-  __ AssertFunction(r6);
 
   // Calling convention for function specific ConstructStubs require
   // r5 to contain either an AllocationSite or undefined.