implement codegen support for __attribute((__gnuc_inline__)),
pulling some attribute munging stuff into GetLinkageForFunction.

This should fix PR3986


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69045 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.h b/lib/CodeGen/CodeGenModule.h
index f540a73..06118ac 100644
--- a/lib/CodeGen/CodeGenModule.h
+++ b/lib/CodeGen/CodeGenModule.h
@@ -314,8 +314,10 @@
 
   enum GVALinkage {
     GVA_Internal,
-    GVA_Inline,
     GVA_ExternInline,
+    GVA_GNUCInline,
+    GVA_C99Inline,
+    GVA_CXXInline,
     GVA_Normal
   };