Make LLVMContext and LLVMContextImpl classes instead of structs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78690 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bitcode/Reader/BitcodeReader.h b/lib/Bitcode/Reader/BitcodeReader.h
index a1f9113..bd04888 100644
--- a/lib/Bitcode/Reader/BitcodeReader.h
+++ b/lib/Bitcode/Reader/BitcodeReader.h
@@ -26,7 +26,7 @@
 
 namespace llvm {
   class MemoryBuffer;
-  struct LLVMContext;
+  class LLVMContext;
   
 //===----------------------------------------------------------------------===//
 //                          BitcodeReaderValueList Class