Initial support for the cfi directives. This is just enough to get

f:
        .cfi_startproc
        nop
        .cfi_endproc

assembled (on ELF).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121434 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 944ed26..abc01a2 100644
--- a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -135,7 +135,7 @@
                                SectionKind::getReadOnly());
   EHFrameSection =
     getContext().getELFSection(".eh_frame", MCSectionELF::SHT_PROGBITS,
-                               MCSectionELF::SHF_ALLOC |MCSectionELF::SHF_WRITE,
+                               MCSectionELF::SHF_ALLOC,
                                SectionKind::getDataRel());
 
   // Debug Info Sections.