PPC: [runtime] Implement %_ToLength via ToLengthStub.

src/ppc/interface-descriptors-ppc.cc

Index: src/ppc/interface-descriptors-ppc.cc
diff --git a/src/ppc/interface-descriptors-ppc.cc b/src/ppc/interface-descriptors-ppc.cc
index aa9feb7546c6768b07f02b3dc5cd1123d04ca78e..b54845d4b35e6dc923d93b945a40dfbff2109fce 100644
--- a/src/ppc/interface-descriptors-ppc.cc
+++ b/src/ppc/interface-descriptors-ppc.cc
@@ -100,6 +100,10 @@ void ToNumberDescriptor::InitializePlatformSpecific(
 
 
 // static
+const Register ToLengthDescriptor::ReceiverRegister() { return r3; }
+
+
+// static
 const Register ToStringDescriptor::ReceiverRegister() { return r3; }