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

A pending change will merge MCSection*::getName() to MCSection::getName().
diff --git a/llvm/lib/MC/MCMachOStreamer.cpp b/llvm/lib/MC/MCMachOStreamer.cpp
index cc62a22..557c189 100644
--- a/llvm/lib/MC/MCMachOStreamer.cpp
+++ b/llvm/lib/MC/MCMachOStreamer.cpp
@@ -123,7 +123,7 @@
   // These sections are created by the assembler itself after the end of
   // the .s file.
   StringRef SegName = MSec.getSegmentName();
-  StringRef SecName = MSec.getSectionName();
+  StringRef SecName = MSec.getName();
 
   if (SegName == "__LD" && SecName == "__compact_unwind")
     return true;