Remove use of compiled proxy stub from portable.

ARM implementation is tested, but x86 and MIPS are not.

Change-Id: I497d650c55fe7fd4ea24d283c8d8ee99b1456610
diff --git a/src/class_linker.cc b/src/class_linker.cc
index b5e4020..a9e17b2 100644
--- a/src/class_linker.cc
+++ b/src/class_linker.cc
@@ -2585,8 +2585,7 @@
 #if !defined(ART_USE_PORTABLE_COMPILER)
   method->SetCode(reinterpret_cast<void*>(art_quick_proxy_invoke_handler));
 #else
-  OatFile::OatMethod oat_method = GetOatMethodFor(prototype.get());
-  method->SetCode(oat_method.GetProxyStub());
+  method->SetCode(reinterpret_cast<void*>(art_portable_proxy_invoke_handler));
 #endif
 
   return method;