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

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

llvm-svn: 374934
diff --git a/llvm/lib/Target/TargetLoweringObjectFile.cpp b/llvm/lib/Target/TargetLoweringObjectFile.cpp
index 17274e1..dcd3934 100644
--- a/llvm/lib/Target/TargetLoweringObjectFile.cpp
+++ b/llvm/lib/Target/TargetLoweringObjectFile.cpp
@@ -253,6 +253,7 @@
     auto Attrs = GVar->getAttributes();
     if ((Attrs.hasAttribute("bss-section") && Kind.isBSS()) ||
         (Attrs.hasAttribute("data-section") && Kind.isData()) ||
+        (Attrs.hasAttribute("relro-section") && Kind.isReadOnlyWithRel()) ||
         (Attrs.hasAttribute("rodata-section") && Kind.isReadOnly()))  {
        return getExplicitSectionGlobal(GO, Kind, TM);
     }