Bring r252305 back with a test fix.

We now create the .eh_frame section early, just like every other special
section.

This means that the special flags are visible in code that explicitly
asks for ".eh_frame".

llvm-svn: 252313
diff --git a/llvm/lib/MC/MCSectionELF.cpp b/llvm/lib/MC/MCSectionELF.cpp
index 92d2b966..5a0bb7f 100644
--- a/llvm/lib/MC/MCSectionELF.cpp
+++ b/llvm/lib/MC/MCSectionELF.cpp
@@ -133,6 +133,8 @@
     OS << "note";
   else if (Type == ELF::SHT_PROGBITS)
     OS << "progbits";
+  else if (Type == ELF::SHT_X86_64_UNWIND)
+    OS << "unwind";
 
   if (EntrySize) {
     assert(Flags & ELF::SHF_MERGE);