Revert r270543 ("Recommit r270540")

Failed build bot in another test.
I am sorry for noise.
http://lab.llvm.org:8080/green/job/clang-stage1-cmake-RA-incremental_check/23679/testReport/junit/LLVM/DebugInfo/llvm_symbolizer_zlib_test/

llvm-svn: 270547

llvm/lib/Object/MachOObjectFile.cpp

@@ -653,10 +653,6 @@ uint64_t MachOObjectFile::getSectionAlignment(DataRefImpl Sec) const {
   return uint64_t(1) << Align;
 }
 
-bool MachOObjectFile::isSectionCompressed(DataRefImpl Sec) const {
-  return false;
-}
-
 bool MachOObjectFile::isSectionText(DataRefImpl Sec) const {
   uint32_t Flags = getSectionFlags(this, Sec);
   return Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;