[MC] Rename MCSection*::getSectionName() to getName(). NFC

A pending change will merge MCSection*::getName() to MCSection::getName().
diff --git a/llvm/lib/MC/MCAsmStreamer.cpp b/llvm/lib/MC/MCAsmStreamer.cpp
index 3792655..20a9a1cb 100644
--- a/llvm/lib/MC/MCAsmStreamer.cpp
+++ b/llvm/lib/MC/MCAsmStreamer.cpp
@@ -848,7 +848,7 @@
   // This is a mach-o specific directive.
 
   const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
-  OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
+  OS << MOSection->getSegmentName() << "," << MOSection->getName();
 
   if (Symbol) {
     OS << ',';