Recommit r270070 ([llvm-mc] - Teach llvm-mc to generate compressed debug sections in zlib style.)

Now, after landing r270560, r270557, r270320 it is a proper time.

Original commit message:
[llvm-mc] - Teach llvm-mc to generate compressed debug sections in zlib style.

Before this patch llvm-mc generated zlib-gnu styled sections. 
That means no SHF_COMPRESSED flag was set, magic 'zlib' signature
was used in combination with full size field. Sections were renamed to "*.z*".
This patch reimplements the compression style to zlib one as zlib-gnu looks
to be depricated everywhere.

Differential revision: http://reviews.llvm.org/D20331

llvm-svn: 270569

1 files changed, 0 insertions, 16 deletions

diff --git a/llvm/lib/MC/MCContext.cpp b/llvm/lib/MC/MCContext.cpp
index 67463e583d7..aa15ff69904 100644
--- a/llvm/lib/MC/MCContext.cpp
+++ b/llvm/lib/MC/MCContext.cpp
@@ -285,22 +285,6 @@ MCSectionMachO *MCContext::getMachOSection(StringRef Segment, StringRef Section,
              Segment, Section, TypeAndAttributes, Reserved2, Kind, Begin);
 }
 
-void MCContext::renameELFSection(MCSectionELF *Section, StringRef Name) {
-  StringRef GroupName;
-  if (const MCSymbol *Group = Section->getGroup())
-    GroupName = Group->getName();
-
-  unsigned UniqueID = Section->getUniqueID();
-  ELFUniquingMap.erase(
-      ELFSectionKey{Section->getSectionName(), GroupName, UniqueID});
-  auto I = ELFUniquingMap.insert(std::make_pair(
-                                     ELFSectionKey{Name, GroupName, UniqueID},
-                                     Section))
-               .first;
-  StringRef CachedName = I->first.SectionName;
-  const_cast<MCSectionELF *>(Section)->setSectionName(CachedName);
-}
-
 MCSectionELF *MCContext::createELFRelSection(StringRef Name, unsigned Type,
                                              unsigned Flags, unsigned EntrySize,
                                              const MCSymbolELF *Group,