Update for LLVM API change.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@78259 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenFunction.h b/lib/CodeGen/CodeGenFunction.h
index b814ed7..6a887d1 100644
--- a/lib/CodeGen/CodeGenFunction.h
+++ b/lib/CodeGen/CodeGenFunction.h
@@ -31,7 +31,7 @@
 
 namespace llvm {
   class BasicBlock;
-  class LLVMContext;
+  struct LLVMContext;
   class Module;
   class SwitchInst;
   class Value;