Text sections should have 'exec' flag set. This seems to unbreak libstdc++ on linux.
Patch by Dmitry Gorbachev!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79334 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetLoweringObjectFile.cpp b/lib/Target/TargetLoweringObjectFile.cpp
index ff0180b..67fbc1f 100644
--- a/lib/Target/TargetLoweringObjectFile.cpp
+++ b/lib/Target/TargetLoweringObjectFile.cpp
@@ -487,6 +487,9 @@
   if (!K.isMetadata())
     Flags |= MCSectionELF::SHF_ALLOC;
   
+  if (K.isText())
+    Flags |= MCSectionELF::SHF_EXECINSTR;
+  
   if (K.isWriteable())
     Flags |= MCSectionELF::SHF_WRITE;