mcize lcomm, simplify .comm, extend both to support 64-bit sizes.

llvm-svn: 94299
diff --git a/llvm/lib/Target/PowerPC/PPCMCAsmInfo.cpp b/llvm/lib/Target/PowerPC/PPCMCAsmInfo.cpp
index ba9937b..d2ff3b7 100644
--- a/llvm/lib/Target/PowerPC/PPCMCAsmInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCMCAsmInfo.cpp
@@ -52,7 +52,7 @@
   SetDirective = "\t.set";
   Data64bitsDirective = is64Bit ? "\t.quad\t" : 0;
   AlignmentIsInBytes = false;
-  LCOMMDirective = "\t.lcomm\t";
+  HasLCOMMDirective = true;
   AssemblerDialect = 0;           // Old-Style mnemonics.
 }