Added support for "#pragma clang section relro=<name>"

Differential Revision: https://reviews.llvm.org/D68806

llvm-svn: 374934
diff --git a/clang/lib/Sema/SemaAttr.cpp b/clang/lib/Sema/SemaAttr.cpp
index 3104ea8..70186c9 100644
--- a/clang/lib/Sema/SemaAttr.cpp
+++ b/clang/lib/Sema/SemaAttr.cpp
@@ -266,6 +266,9 @@
     case PragmaClangSectionKind::PCSK_Rodata:
       CSec = &PragmaClangRodataSection;
       break;
+    case PragmaClangSectionKind::PCSK_Relro:
+      CSec = &PragmaClangRelroSection;
+      break;
     case PragmaClangSectionKind::PCSK_Text:
       CSec = &PragmaClangTextSection;
       break;