Add support for pushsection and popsection. Patch by Joerg Sonnenberger.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125629 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCMachOStreamer.cpp b/lib/MC/MCMachOStreamer.cpp
index 7e1cda2..d1f9f5c 100644
--- a/lib/MC/MCMachOStreamer.cpp
+++ b/lib/MC/MCMachOStreamer.cpp
@@ -105,7 +105,7 @@
   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
 
   // isSymbolLinkerVisible uses the section.
-  Symbol->setSection(*CurSection);
+  Symbol->setSection(*getCurrentSection());
   // We have to create a new fragment if this is an atom defining symbol,
   // fragments cannot span atoms.
   if (getAssembler().isSymbolLinkerVisible(*Symbol))