don't misencode CC#'s


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24219 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bytecode/Reader/Reader.cpp b/lib/Bytecode/Reader/Reader.cpp
index 372a5b5..f52cfa6 100644
--- a/lib/Bytecode/Reader/Reader.cpp
+++ b/lib/Bytecode/Reader/Reader.cpp
@@ -1999,7 +1999,7 @@
       CC |= ((ExtWord >> 5) & 15) << 4;
     }
     
-    Func->setCallingConv(CC);
+    Func->setCallingConv(CC-1);
     Func->setAlignment(Alignment);
 
     if (Handler) Handler->handleFunctionDeclaration(Func);