Strip off parens and no-op casts when deciding if an expr can be devirtualized. Fixes the second half of PR9660.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@129253 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGenCXX/devirtualize-virtual-function-calls.cpp b/test/CodeGenCXX/devirtualize-virtual-function-calls.cpp
index 74795b5..5eede66 100644
--- a/test/CodeGenCXX/devirtualize-virtual-function-calls.cpp
+++ b/test/CodeGenCXX/devirtualize-virtual-function-calls.cpp
@@ -2,7 +2,8 @@
 
 struct A {
   virtual void f();
-  
+  virtual void f_const() const;
+
   A h();
 };
 
@@ -28,6 +29,12 @@
   
   // CHECK: call void @_ZN1A1fEv
   a.h().f();
+
+  // CHECK: call void @_ZNK1A7f_constEv
+  a.f_const();
+
+  // CHECK: call void @_ZN1A1fEv
+  (a).f();
 }
 
 struct B {
@@ -45,3 +52,4 @@
   // CHECK: call void @_ZN1B1fEv
   B().h().f();
 }
+