MC: Replace MCSection's SV_MachO check with MCContext::IsMachO

Author: MaskRay

llvm/lib/MC/MCAsmStreamer.cpp

@@ -1105,7 +1105,7 @@ void MCAsmStreamer::emitZerofill(MCSection *Section, MCSymbol *Symbol,
   // Note: a .zerofill directive does not switch sections.
   OS << ".zerofill ";
 
-  assert(Section->getVariant() == MCSection::SV_MachO &&
+  assert(getContext().getObjectFileType() == MCContext::IsMachO &&
          ".zerofill is a Mach-O specific directive");
   // This is a mach-o specific directive.
 
@@ -1130,7 +1130,7 @@ void MCAsmStreamer::emitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
 
   // Instead of using the Section we'll just use the shortcut.
 
-  assert(Section->getVariant() == MCSection::SV_MachO &&
+  assert(getContext().getObjectFileType() == MCContext::IsMachO &&
          ".zerofill is a Mach-O specific directive");
   // This is a mach-o specific directive and section.