move ELF-specific code into ELFTargetAsmInfo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76976 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetAsmInfo.h

@@ -586,7 +586,13 @@ namespace llvm {
     virtual const char *
     getSectionPrefixForUniqueGlobal(SectionKind::Kind Kind) const;
     
-    
+    /// getFlagsForNamedSection - If this target wants to be able to infer
+    /// section flags based on the name of the section specified for a global
+    /// variable, it can implement this.  This is used on ELF systems so that
+    /// ".tbss" gets the TLS bit set etc.
+    virtual unsigned getFlagsForNamedSection(const char *Section) const {
+      return 0;
+    }
     
     
     /// SectionKindForGlobal - This hook allows the target to select proper