leopard and above support alignment for common symbols.

llvm-svn: 45493
diff --git a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
index f4b689a..5deb41b 100644
--- a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -930,6 +930,9 @@
       } else {
         SwitchToDataSection("\t.data", I);
         O << ".comm " << name << "," << Size;
+        // Darwin 9 and above support aligned common data.
+        if (Subtarget.isDarwin9())
+          O << "," << Align;
       }
       O << "\t\t" << TAI->getCommentString() << " '" << I->getName() << "'\n";
     } else {