stop using the .lcomm pseudoop on darwin, instead, directly use the
.zerofill directive.  Streamerize its generation.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93868 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCAsmInfoDarwin.cpp b/lib/MC/MCAsmInfoDarwin.cpp
index a1f6051..664a55c 100644
--- a/lib/MC/MCAsmInfoDarwin.cpp
+++ b/lib/MC/MCAsmInfoDarwin.cpp
@@ -33,15 +33,15 @@
   WeakDefDirective = "\t.weak_definition ";
   WeakRefDirective = "\t.weak_reference ";
   HiddenDirective = "\t.private_extern ";
-  LCOMMDirective = "\t.lcomm\t";
   ZeroDirective = "\t.space\t";  // ".space N" emits N zeros.
   HasMachoZeroFillDirective = true;  // Uses .zerofill
   HasStaticCtorDtorReferenceInStaticMode = true;
-  LCOMMDirectiveTakesAlignment = true;
   SetDirective = "\t.set";
   ProtectedDirective = "\t.globl\t";
   HasDotTypeDotSizeDirective = false;
   UsedDirective = "\t.no_dead_strip\t";
+  // Note: Even though darwin has the .lcomm directive, it is just a synonym for
+  // zerofill, so we prefer to use .zerofill.
 
   // _foo.eh symbols are currently always exported so that the linker knows
   // about them.  This is not necessary on 10.6 and later, but it