[runtime] [proxy] implement [[Construct]]

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 ff212f0297bdfeac7185b1b2daf3a7abdf2d9cbe..7caad399aaf18cef79dafde6ea9f61cd6a7928f5 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -1764,8 +1764,14 @@ void Builtins::Generate_ConstructProxy(MacroAssembler* masm) {
   //          the JSFunction on which new was invoked initially)
   // -----------------------------------
 
-  // TODO(neis): This doesn't match the ES6 spec for [[Construct]] on proxies.
-  __ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
+  // Call into the Runtime for Proxy [[Construct]].
+  __ Push(r4);
+  __ Push(r6);
+  // Include the pushed new_target and the constructor/receiver at the bottom.
+  __ addi(r3, r3, Operand(3));
+  // Tail-call to the runtime.
+  __ JumpToExternalReference(
+      ExternalReference(Runtime::kJSProxyConstruct, masm->isolate()));
 }