PPC: [interpreter] Add basic framework for bytecode handler code generation.

src/compiler/ppc/linkage-ppc.cc

Index: src/compiler/ppc/linkage-ppc.cc
diff --git a/src/compiler/ppc/linkage-ppc.cc b/src/compiler/ppc/linkage-ppc.cc
index ebea4452aea62c7230ad263dff0e3de0dc89f50d..d9404bf89eae79ca3fc1d683d8cd51988ec52a6d 100644
--- a/src/compiler/ppc/linkage-ppc.cc
+++ b/src/compiler/ppc/linkage-ppc.cc
@@ -17,6 +17,8 @@ struct PPCLinkageHelperTraits {
   static Register ReturnValue2Reg() { return r4; }
   static Register JSCallFunctionReg() { return r4; }
   static Register ContextReg() { return cp; }
+  static Register InterpreterBytecodePointerReg() { return r14; }
+  static Register InterpreterDispatchTableReg() { return r15; }
   static Register RuntimeCallFunctionReg() { return r4; }
   static Register RuntimeCallArgCountReg() { return r3; }
   static RegList CCalleeSaveRegisters() {
@@ -68,9 +70,8 @@ CallDescriptor* Linkage::GetSimplifiedCDescriptor(Zone* zone,
 }
 
 
-CallDescriptor* Linkage::GetInterpreterDispatchDescriptor(
-    Zone* zone, const MachineSignature* sig) {
-  return LH::GetInterpreterDispatchDescriptor(zone, sig);
+CallDescriptor* Linkage::GetInterpreterDispatchDescriptor(Zone* zone) {
+  return LH::GetInterpreterDispatchDescriptor(zone);
 }
 
 }  // namespace compiler