Set correct calling convention even if there is a bitcast in the way.
This attempts to fix PR4239.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72251 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGCall.cpp b/lib/CodeGen/CGCall.cpp
index 718a515..356caa3 100644
--- a/lib/CodeGen/CGCall.cpp
+++ b/lib/CodeGen/CGCall.cpp
@@ -2100,7 +2100,7 @@
   }
 
   CS.setAttributes(Attrs);
-  if (const llvm::Function *F = dyn_cast<llvm::Function>(Callee))
+  if (const llvm::Function *F =  dyn_cast<llvm::Function>(Callee->stripPointerCasts()))
     CS.setCallingConv(F->getCallingConv());
 
   // If the call doesn't return, finish the basic block and clear the