Compute the ELF SectionKind from the flags.

Any code creating an MCSectionELF knows ELF and already provides the flags.

SectionKind is an abstraction used by common code that uses a plain
MCSection.

Use the flags to compute the SectionKind. This removes a lot of
guessing and boilerplate from the MCSectionELF construction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227476 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/ErlangGCPrinter.cpp

@@ -52,8 +52,8 @@ void ErlangGCPrinter::finishAssembly(Module &M, GCModuleInfo &Info,
 
   // Put this in a custom .note section.
   AP.OutStreamer.SwitchSection(
-      AP.getObjFileLowering().getContext().getELFSection(
-          ".note.gc", ELF::SHT_PROGBITS, 0, SectionKind::getDataRel()));
+      AP.getObjFileLowering().getContext().getELFSection(".note.gc",
+                                                         ELF::SHT_PROGBITS, 0));
 
   // For each function...
   for (GCModuleInfo::FuncInfoVec::iterator FI = Info.funcinfo_begin(),