Add support for Embedded Constant Pools for PPC and Arm

src/ppc/frames-ppc.cc

Index: src/ppc/frames-ppc.cc
diff --git a/src/ppc/frames-ppc.cc b/src/ppc/frames-ppc.cc
index a09bbeb73174afdd13a4cf2a781991976ca8fa54..1e54c4696322f175b018c6313bdb2f79c4a0f80f 100644
--- a/src/ppc/frames-ppc.cc
+++ b/src/ppc/frames-ppc.cc
@@ -21,22 +21,16 @@ namespace internal {
 Register JavaScriptFrame::fp_register() { return v8::internal::fp; }
 Register JavaScriptFrame::context_register() { return cp; }
 Register JavaScriptFrame::constant_pool_pointer_register() {
-  UNREACHABLE();
-  return no_reg;
+  DCHECK(FLAG_enable_embedded_constant_pool);
+  return kConstantPoolRegister;
 }
 
 
 Register StubFailureTrampolineFrame::fp_register() { return v8::internal::fp; }
 Register StubFailureTrampolineFrame::context_register() { return cp; }
 Register StubFailureTrampolineFrame::constant_pool_pointer_register() {
-  UNREACHABLE();
-  return no_reg;
-}
-
-
-Object*& ExitFrame::constant_pool_slot() const {
-  UNREACHABLE();
-  return Memory::Object_at(NULL);
+  DCHECK(FLAG_enable_embedded_constant_pool);
+  return kConstantPoolRegister;
 }
 }  // namespace internal
 }  // namespace v8