[regexp] Remove remainder of native RegExpExecStub

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 734ed4af366050755e5e6c884ee2fc37f7edce76..19cbce46f01c867ec43dae0dc58c6c15432d2e9f 100644
--- a/src/ppc/interface-descriptors-ppc.cc
+++ b/src/ppc/interface-descriptors-ppc.cc
@@ -56,11 +56,6 @@ const Register MathPowIntegerDescriptor::exponent() {
   return MathPowTaggedDescriptor::exponent();
 }
 
-const Register RegExpExecDescriptor::StringRegister() { return r3; }
-const Register RegExpExecDescriptor::LastIndexRegister() { return r4; }
-const Register RegExpExecDescriptor::StringStartRegister() { return r5; }
-const Register RegExpExecDescriptor::StringEndRegister() { return r6; }
-const Register RegExpExecDescriptor::CodeRegister() { return r17; }
 
 const Register GrowArrayElementsDescriptor::ObjectRegister() { return r3; }
 const Register GrowArrayElementsDescriptor::KeyRegister() { return r6; }